Planck's Constant and The Origin of Quantum Mechanics | Space Time | PBS Digital Studios

Подписаться 3,1 млн

Просмотров 1,9 млн

50% 1

To check out any of the lectures available from Great Courses Plus go to ow.ly/K9mK301cRdj and get ready to learn about everything from cooking to calculus.
Previous episode on Quantum Tunneling and the de Broglie Wavelength: • Is Quantum Tunneling F...
Get your own Space Time tshirt at bit.ly/1QlzoBi
Tweet at us! @pbsspacetime
Facebook: pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: / pbsspacetime
Support us on Patreon! / pbsspacetime
Help translate our videos! ru-vid.com_cs_p...
Planck's Length is the length below which the concept of length loses its meaning. What exactly does that mean and what are the incredible implications this fact has upon our reality? To find out check out this episode of Space Time where Matt digs into the early history of quantum mechanics.
Written and hosted by Matt O’Dowd
Made by Kornhaber Brown (www.kornhaberbrown.com)
Comments by:
BrunoJMR
• The Strange Universe o...
Prasad Deshmukh
• The Strange Universe o...
Gary Palmer
• The Strange Universe o...
Ed Eggermont
• The Strange Universe o...
Dylan T
• The Strange Universe o...

Опубликовано:

21 июн 2016

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 2,8 тыс.

@tompenny5684 Год назад

This has to be possibly the most professional and well put together physics channel on RU-vid. From the animations to the logical descriptions which make difficult concepts make sense! This has given me so much to write about for my formal report on Black Body radiation. Thank you!

@Woodmakerstudios 8 лет назад

I love watching PBS, it makes me feel more intelligent than I am.

@raidermaxx2324 8 лет назад

-Woobywooo dont sell urself short man.. the fact that this type of content interests you instead of honey boo boo's channel already sets u apart from 90% of the population.. also reading books on these subjects are a great way to compliment these videos to help comprehension.. another great channel is Isaac Arthur's channel.. he talks about more hypothetical concepts like the Fermi paradox, Rocheworld's, transhumanism, Dyson spheres, etc.. dude is very smart, and doesnt include so much math and science.. its more conceptual.. check him out:)

@Woodmakerstudios 8 лет назад

Cheers Neo, I will most certainly check him out! I have a lot of theories myself but I lack the knowledge of actually proving them right ( Or wrong ). I will hopefully change that in the future! Either way, these video's are fascinating

@wholeNwon 8 лет назад

Complement.

@busteraycan 8 лет назад

Wot! It does exactly opposite to me!?

@AG-sy4wt 8 лет назад

ya id like to see them show us how to use some of the equations, that would be sik!

@T33K3SS3LCH3N 5 лет назад

Math teachers: Zeno's paradox is easy. You can overtake the tortoise because we have calculus. Quantum Physicists: WE DONT EVEN KNOW WHERE YOU ARE

@manspider9152 4 года назад

An underrated comment

@Reach3DPrinters 4 года назад

You can only describe how the overtaking would be approached and that overtaking would take infinity... as well as what quadrant one is overtaking in.

@Sunspot1225. 4 года назад

The elements that go zero in calculus, don't. So the resultant answer is a little bit off by the Planck's Constant.

@Reach3DPrinters 4 года назад

@@Sunspot1225. Planck suggests reality is digital! :)

@fghsgh 4 года назад

We especially don't know where you are if we know you're running at a speed.

@jaybyrdcybertruck1082 7 лет назад

Im a highschool graduate with no schooling in Quantum Physics but I Have a real passion for it and these videos are absolutely fantastic! I was never good at math but I understand the theories very well!! love these videos!

@javiercastro8466 10 месяцев назад

Don’t give up. I am horrible at math and school in general. I am self taught in physics and was able to work in an engineering capacity despite not having a real formal education. I am a student of science although I have no aptitude to being a student in school.

@Bill-ou7zp 10 месяцев назад

Sorry, but you don’t understand any ‘theories’ without the math. The day you think you understand quantum mechanics is the day you can be certain you don’t

@mysmirandam.6618 10 месяцев назад

Same. So weird never took it outta all the college I've had

@mysmirandam.6618 10 месяцев назад

@javiercastro8466 how did you do that because same. I would always get c's in math in hs but inly passed because I would try and get tutored. I tried 4 times to pass algebra in college Then got a's in a different college because my math professor taught me how I learn? I figured out I have dyscalcula because of his genius

@harshitshukla7382 8 лет назад

After watching these lectures i really feel science has scratched the surface, there's so much to learn, and thanks to channels like these, we are getting to question again and wonder at the world around us, a trait long lost with childhood!

@Moonbo 8 лет назад

Damn I love this channel!

@clarkfeeley1959 8 лет назад

Yeah this dude is so intelligent it's frightens me.

@ayylmao2710 8 лет назад

not to hate on him, but with enough time and research anyone can become as smart as him. it's one of the more awesome parts of being human!

@clarkfeeley1959 8 лет назад

LeFlyingSaucer LOL sorry I don't get that vibe. He's likeable and all but I'm not a switch hitter. My brains incapable of thinking in those terms.

@CarlosMats 8 лет назад

i can't stop repeating it either! Best content on the web as of today.

@TrailRunnerLife 8 лет назад

Totally agree!

@kermanguy1877 5 лет назад

Imagine just accidentally figuring out one of the universal constants.

@abhirajdutta327 4 года назад

WoWoWoWoWoWoW

@Reach3DPrinters 4 года назад

I don't agree, Its only a constant relative to what is needed to make measurements. The actual constant doesn't exist. Space time has no segmentation, it is analog, even if it can only be perceived digitally... in fact all real numbers are digital... we would have to describe nature with only unreal numbers to achieve a decent representation of our universe.

@l0kexh 4 года назад

Nothing is random they spend their lifetimes doing and calculating things . I repeat nothing is random

@narajuna 4 года назад

Hum must not be hard to imagine; aint there a LOT of Chance accidents around here? Primates sustain on accidental figures...

@Thundralight 4 года назад

@@Reach3DPrinters I think it has to do with different states of consciousness Do animals or insects have what is needed to take a measurement in the way we can take a measurement of something.

@ttrestle Год назад

I just love how popular this channel is. Many times I don’t understand what’s being talked about but I always watch every vid. Sometimes multiple times.

@EchoL0C0 8 лет назад

I feel like this video doesn't give Planck enough credit. Trying out lots of different ideas to re-create a distribution is not the same as mashing random buttons. For one thing, all buttons have a chance of getting pressed, but not all ideas (such as dividing the whole equation by 0) are valid. Also, it makes coming up with all these ideas sound a lot easier than it is. Lastly, his result was caused by trial-and-error, not pure random chance.

@ArthurCammers 5 лет назад

Yes the video did not give Planck enough credit. He was studying entropy and a student of Boltzmann's work. He too stood on the shoulders of giants.

@KipIngram 4 года назад

Planck was completely brilliant. He also understood the full impact of what he'd just done, because he HATED IT.

@gaussianvector2093 2 года назад

@@KipIngram yup, it wasn't until Einstein believed him that people saw it as fundamental and not just a classical puzzle. Enter Quantum Mechanics, then Einstein hated what he'd done! Bohr was really the one we needed, a true believer in h and all of its consequences.

@Kevsterr158 Месяц назад

When bro actually studies 8 hours a day :

@vinayseth1114 6 лет назад

9:27- Who else laughed when he said 'As usual, it took Albert Einstein...'? :D

@riptorn4722 5 лет назад

Seems tv shpw for them object moving all around adderall only works on in nechanics little nemo on hbo: am-jazera which hbo v ecplain I in..

@tomrhodes1629 5 лет назад

I like to look at it this way: "Heck, you know he was smart. His name was Einstein!!" Give me a "click" if you're open-minded and want the secrets of the Universe...no joke.

@golfinhocomchamas4054 4 года назад

@Goble By solving what their original creators coulden't...

@419Audio 4 года назад

me too 🙂

@Sunspot1225. 4 года назад

Albert Einstein once said that if you want the smartest physicist go see Tesla.

@albertrenshaw4252 5 лет назад

Favorite line of the video: 9:22 "As usual, it took Albert Einstein, to..." Lmao

@vishalmishra4408 6 лет назад

Max Planck may have never imagined that his constant would be used in 2018-19 to define New/Quantum SI unit of Mass (the Kilogram Kg).

@BeCurieUs 8 лет назад

There have been a lot of great episodes here, but this one is by far my favorite. I like hearing the history of the math and scientists as much as the science. The story about Plank and him going "huh, try this" was really fun. And I really like the integration of the tortoise analogy with BB radiation and Plank length. Everything just worked for me :D

@gmtoomey 8 лет назад

Its a great explanation, probably the best I've seen.

@MaBuSt 8 лет назад

I'm a PhD in Materials Science. I also had a phenomenal Materials Properties course as an undergrad. This was still one of the best ways of diagrammatically showing the origins of the UV catastrophe (at 6:43)

@johnasgonzales4503 4 года назад

VERY HARD PROBLEM “As usual it took Albert Einstein”

@MegaBaddog 4 года назад

www.amazon.com/Albert-Einstein-Incorrigible-Christopher-Bjerknes/dp/0971962987 The name "Einstein" evokes images of genius, but was Albert Einstein, in fact, a plagiarist, who copied the theories of Lorentz, Poincare, Gerber, and Hilbert? A scholarly documentation of Albert Einstein's plagiarism of the theory of relativity, "Albert Einstein: The Incorrigible Plagiarist" discloses Einstein's method for manipulating credit for the work of his contemporaries, reprints the prior works he parroted, and demonstrates through formal logical argument that Albert Einstein could not have drawn the conclusions he drew without prior knowledge of the works he copied, but failed to reference. Numerous republished quotations from Einstein's contemporaries prove that they were aware of his plagiarism.

@Thundralight 4 года назад

They have studied Einstein's brain and the folds in it are much deeper than a normal brain

@achyuththouta6957 4 года назад

@@MegaBaddog Nobody cares. Anyone who has read a book written by Einstein knows your comment is bullshit

@filename1674 4 года назад

@@MegaBaddog well thats how science works buddy. We copy the work of others to make an even greater statements to understand the universe

@MegaBaddog 4 года назад

@@Thundralight nice comedy

@Sett86 6 лет назад

So. Einstein discovered dark energy almost a century ahead of everyone else because his math wasn't working out without it. Planck discovered quantization of light because his math wasn't working out without it. Do I see a pattern here?

@phoenix03ist 5 лет назад

What do you mean?

@deathbydeviceable 5 лет назад

If you wanna get technical the dark energy is all around us, it's called gravity. It's the lack of gravity that creates anti-matter, cause no gravity is there to keep it intact. I'm off my rocker, let me just get back in my seat

@Asijantuntia 5 лет назад

So you're implying this was all made up because someone just had to invent new stuff to make their theory work? Then how do you explain that we can actually detect these quantum phenomena? For example physicists are having trouble making computer processor chips in smaller scales, because the quantum tunneling effect makes the transistor gates randomly not work.

@sidewaysfcs0718 5 лет назад

@Bob Harris Well, technically, they are. Doesn't mean they can't be true. We know for a fact that the h constant is good, Planck just plugged it in to make the theory work.

@janinduherath5974 5 лет назад

And we get an F when our math doesn't work out........

@n4thanfv 8 лет назад

*The best* channel on YT!! Thanks for another video that enlightens us all on the beauty of the universe! *Q:* _Is there an independent experimental method to measure the Planck's Constant?_ I ask this because for what I understood, they calculated it based on previous measurements, so it was more like a math trick.

@ArgoIo 8 лет назад

One can actually derive Planck's Constant from the photo electric effect itself.

@LKAChannel 8 лет назад

+Lorenz Zahn Exactly, we did that in 12th grade.

@adamhogan4267 8 лет назад

the photo electric effect can measure the planks constant by an experiment where a light source is shone onto a specific metal which cause some of the electrons to be ejected from the metal. there will be a certain voltage within the circuit which you can measure just by using a variable voltage supply and so because of the equation V=J/Q you can rearrange to get the J=VQ where J is the minimum kinetic energy that the photon needs to overcome the voltage which is also know as the stopping voltage. once you know this you can use the equation E=Hf-Ø to work out planks constant where E is the kinetic energy of the photon, F is the frequency on the light and Ø is the work function, which is the minimum energy that needs to be given to a photon to be ejected from the surface of the metal, hope this helps

@LKAChannel 8 лет назад

MultiMdave What was posted here is not even theoretical physics, it's experimental physics. Theoretical physics is where it gets completely crazy and where without very advanced math skills you will despair. (trust me, I'm studying Physics and Astronomy in Bonn University)

@valeriobertoncello1809 8 лет назад

But why is plank's constant called "h" ?!

@MooImABunny 8 лет назад

"I'm glad we could help you guys entangled" holy crap that was the most wonderful geeky thing I've heard in a while XD

@rudiepunk85 8 лет назад

As they say.. I'll science anybody I want

@tubeofvideos 5 лет назад

He should have completed saying "not in a quantum entanglement".

@iainballas 6 лет назад

"I'm glad we could help you guys get entangled" Keeping education Classy. Thanks, that made my day!

@no_more_free_nicks 5 лет назад

Absolutely brilliant episode, I was wondering where from this constant came from, but the process is just amazing!

@Atodaso 8 лет назад

LOL'd @ " *_Space Time and Chill_*" / "I'm glad we could help you guys " *_get entangled_*."

@AutisticBoardGamer 8 лет назад

who wouldn't get entangled to science?

@maycksonvogas3129 8 лет назад

Awesome!! That was the best explanation of Plank constant since my high school, I never got very well this subject. When you think of a limit of the quantum scale, really simplifies it. Thanks

@bdz_4206 2 года назад

The BEST episode. Never fear being silly!

@filthyactsatareasonablepri8136 5 лет назад

Actually, quantum mechanics forbids this.

@TheDearestHunter 5 лет назад

|FilthyActsAtAReasonablePrice| KILLA QUEEN

@berniexs1500 5 лет назад

Timestamp of clip

@samsungsmartfridge8632 5 лет назад

Saltee Potatochippr sadly it isn’t in this video but it is here ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HF-9Dy6iB_4.html at about 4:30

@xQuiero 5 лет назад

100th liek

@xxxxxx5868 5 лет назад

@@bobito3861 r/wooosh

@SayyadinaHeresy 8 лет назад

Thank you so much, PBS Spacetime for these videos on the quantum realm! They are so clear and concise! I'm very much enjoying these!

@BoomBrush 2 года назад

That moment at 9:40 was a "lightbulb" moment for me. The explanation is amazing here, well done with the video!

@MrGyulaBacsi 4 года назад

Although it might sound exaggerated IMHO, this "math trick" was the single most important moment of the entire history of Science.

@Bobby-fj8mk 7 лет назад

My university professors never explained Planck's constant as well as this. We just learnt the formulas to pass our exams - how bad is that?

@JoshYates 7 лет назад

Institutions are dying. Society probably collapsing and rebuilding because of the internet disruption. Damn my student loans!

@Bobby-fj8mk 7 лет назад

Hopefully your lecturers were better than mine & as good as this RU-vid video?

@jorymil 3 года назад

Depending the class or classes you took, it's not _that_ surprising. They're trying to fit 400 years of science into a semester or two, so the history and justification for the physical laws sadly gets left out sometime. I'm not sure why that's acceptable: it seems better for entry-level chemistry/physics students to cover a little less material, but understand where it comes from. If you majored in chemistry or physics and your professors didn't cover the blackbody spectrum, the ultraviolet catastrophe, Planck's solution, and give you problems to derive the formula for yourself, shame on them: this is something that should be covered in a thermodynamics or intro to quantum mechanics class.

@conorm2524 3 года назад

@@jorymil I always wished lecturers would give a heads up on what we were going to cover next time. I find it much easier to learn something "new" when I've had a chance to introduce it to myself for a little while first. Brand-brand-new concepts usually overwhelm me somewhat.

@jorymil 3 года назад

@@conorm2524 Preach it, sir! A good syllabus can certainly help with that, but providing that context in-lecture, almost like a TV serial, certainly would be helpful sometimes. Depends on class size and format, too.

@RyanCelsiusMusic 8 лет назад

Love this channel, can't wait for next weeks episode!

@noahforester7715 2 года назад

why are YOU here

@nenmaster5218 2 года назад

@@Lightson_you What kind of doubts? You dont wanna tell us you belong to the Flat-Earthers that say the Sun is a Hologram or a Painting, right?? ?

@yuke... 2 года назад

DAMN

@ayseraysertaha7594 2 года назад

Again why is the ultra violet is catastrophic

@DavidTJames-yq9dr 2 года назад

that was great. I love going back and watchig these. New, or as a refresher, a seriously good watch.

@cec831 4 года назад

"When he (Planck) came up with in his moment of desperation..." A powerful statement!

@abundantsoul6487 10 месяцев назад

i am so grateful to god that he made me stumble on this channel . as i am an indian student the people from my country who create videos on this stuff are all occupied by JEE , NEET AND CBSE no one is interested in science rather all r interested in marks . thank u for this beautiful explanation

@schmetterling4477 10 месяцев назад

Which god? We invented so many of them. Especially in India. ;-)

@dbartholemewfox 8 лет назад

Wow, I think this might be the best episode yet! Can we get a part 2 on the origin of quantum mechanics?

@sholmen1872 3 года назад

This was a mindblowing explanation to the tortoise problem. Never thought about it from a quantum perspective!

@afshinmansoorieh824 Год назад

Thank you PBS for another excellent science episode. The video production and story telling is built beautifully and logically so it's easy to follow and understand . Excellent, thank you .

@zikermu 6 лет назад

Awesome. thank you very much for this very educational video (the flow of words is correct, the tone is not monotonous, the verbal and non-verbal languages are adapted, the subject of the course is very well mastered, the sound and video are qualities ). I had a nice and informative time.

@theambient1 7 лет назад

My favourite channel by far! Great video and excellent explanation! But actually the one thing that really made my day was the fact that you used Terry Pratchett's Discworld-Tortoise. He sure would have loved to see this! Keep up your amazing work!

@Kehlvowen 7 лет назад

"...help you guys get entangled." I love everything that you stand for.

@jpaine619 4 года назад

These videos are freakin' awesome. The host does a great job of making it easy for a non-scientist to understand.

@satori92 7 лет назад

you are seriously THE BEST, you bring me back to the school desk, when I was discovering such things for the first time, and then reading on books and science magazines, watching Carl Sagan on the tv... amazing

@Xollas 7 лет назад

Our hero wandered down the mean streets of Blackbody Radiation and stumbled upon the Ultraviolet Catastrophe. The hero thought he must have taken a wrong turn somewhere in the past to be forced to confront this horrendous monster. The Ultraviolet Catastrophe wrestled aggressively with our hero. In a moment of desperation our hero discovered a weapon. He took Planck's Constant and used it against the Ultraviolet Catastrophe. Then out of nowhere a friend appears and blasts the Ultraviolet Catastrophe with his powerful laser the Photoelectric Effect. The friend helped up our hero and both were awarded medals for their achievements. At that moment everything in the city had changed...

@davep8221 5 лет назад

Now we need a "Far Side" illustration.

@calculon000 8 лет назад

If Space itself is expanding, does that mean that the Planck Constant of that space is expanding as well? If not, does this imply some kind of universal framework of distance?

@Kaepsele337 8 лет назад

No, because ħ doesn't really pixelate position, it pixelizes the so called "action". If you fix momentum, this is equivalent to position pixelation, but that's not fundamental. Also, note the difference between "position in space" and "spacetime" itself. Nobody knows how to quantize (i.e. pixelate) spacetime, but in any case expanding space would probably just mean more pixels and not larger pixels. Planck's constant is constant.

@peterburgess9735 8 лет назад

Great question, and great answer!

@JuBerryLive 8 лет назад

Conservation of energy relies on the symmetry of your system under time translation (see Noether Theorem). In a system that is not time translation invariant, eg expanding universe, energy doesn't have to be conserved. The plank constant is not expanding. Only more space is created.

@escupetube 8 лет назад

No cause it's a constant, doesn't matter if space is expanding

@SkyAce200 8 лет назад

The Loop Quantum Gravity theory basically describes a quantized spacetime with a granular structure. We're a little far to being able to prove it, but it's a good theory in my opinion.

@TheKimpula 3 года назад

What an informational video, I loved the formatting and sequencing!

@yulichen6499 5 лет назад

Thank you so much for this video, helped me so much with my assessment that has been stressing me out this whole term.

@Master_Therion 8 лет назад

How many Planck Lengths would a wood plank length be?

@jfhow 5 лет назад

How many planks would a Planck length nail, if a Planck length could nail wood?

@Nomphalos 5 лет назад

How many planck lengths would a platypus platinum plate if a platypus platinum plated plancks?

@genesanborn2367 5 лет назад

As long as a wood plank length could be

@deanwinchest3906 5 лет назад

"If a wood plank could plank wood"

@aprameyaneopane7766 5 лет назад

We will never sleep cuz sleep is for the weak!!!!!!!!!🤘🏻🤘🏻🤘🏻🤘🏻🤘🏻🔥🔥🔥🤘🏻

@professorfoxtrot 8 лет назад

The cover looks like Dark Side of the Moon by Planck Floyd.

@jackhill2765 4 года назад

Thank you for (1) a clear, concise and comprehensive explanation of exactly what the "ultra violet catastrophe" was and how reformulating conventional wisdom (the Rayleigh-Jean Law) by incorporating Plank's constant to form the Plank Black Body Law, quantized the relationship between frequency and energy, resolving the issue, (2) for confirming that the flaw in the Rayleigh-Jean Law was fundamentally the same misconception as that leading to Zeno's paradoxes, and finally, (3) for tying it all together by showing how the fallout from Plank's idea essentially resolves both issues not to mention giving birth to QM. I also appreciate seeing the actual Rayleigh-Jean Law & Plank Black Body Law. Understanding the history is a necessary first step toward understanding the result. Extremely well done!

@amazinggolfshot 6 лет назад

This is the best explanation of the shape of black body radiation curve I have ever seen. Great job!

@MattRieckman 8 лет назад

These topics are so... badly unexplained in most other places. This channel does an absolutely perfect job of making it understandable.

@RSP13 8 лет назад

3:03 When he says "Science fact" I immediately remember of Beakman!

@madierenee473 5 лет назад

I had to pause around 2:00 just to appreciate how amazing this is, my mind is blown! I haven't gotten to take any quantum mechanics classes yet, but now I'm even more excited!

@januszpawlikowski6627 2 года назад

You want to take classes in quantum mechanics based on RU-vid? Anyway, 3 years passed since your comment, I hope you somehow made it.

@0GRAVITYGAMER 5 лет назад

Wow im so amazed, i never knew what plancks constant a question always probing my mind. But now I know the plancks constant represents the boundary between classical and quantum physics. Truly spectacular

@a.wolfgang6423 5 лет назад

5:10

@los1wochos 7 лет назад

As usual it took albert Einstein to fully understand this. God, fuck, how can one sinlge human be on a level so far above everyone else. This line had me laughing, and then just baffled.

@nickieshadowfaxbrooklyn5192 6 лет назад

los1wochos bs. Pr and money to hide etherium. So much wrong in GRT and SRT, but it comes by steps. When you make wrong assumptions, your theory can’t be right. Another ultraviolet catastrophe is about to happen, if not that we have crisis in physics already.

@Phobos_Anomaly 6 лет назад

Nickie Shadowfax Brooklyn "When you make wrong assumptions, your theory can't be right." That's actually incorrect.

@angusharvey686 6 лет назад

los1wochos Indeed! ........🤔

@higgsbonbon 5 лет назад

@@nickieshadowfaxbrooklyn5192 Wut

@rickrose5377 5 лет назад

Spectacular! And fully comprehensible (which can't necessarily be said of all of these). The implications of this fact and of its discovery are awesome in the truest sense of that overused word. Thanks.

@andyeverett1957 5 лет назад

What a thought provoking treat, thank you.

@Teddy0567 8 лет назад

Wow, this video was really easy to understand, the videos about the space-time curvature equasions were a lot harder for me to understand. Really well explained! thanks.

@therenjoseph 8 лет назад

What happens if you increase the temperature of an object to a point where the wavelength of light it emits is smaller than the Planck length? Is it impossible to increase the temperature any more?

@KohuGaly 8 лет назад

that's where currently known physics breaks down. A wavelength of planck length has such amount of energy, that gravity becomes comparable with other physical forces and we currently lack a theory which would describe such state.

@joeybeauvais-feisthauer3137 8 лет назад

KohuGaly is right, our understanding of physics breaks down at that point; your object would have the Planck temperature. But the energy density of such a thing would be such that it would have collapsed into a black hole way before that point.

@shrekogreton6405 8 лет назад

look up "Kugelblitz"

@garethdean6382 8 лет назад

That's not possible. In so many ways. Firstly at a temperature far below that 'pair production' causes hot objects to start emitting electron-positron pairs as well as EM radiation. Keep pumping in energy and 'electroweak symmetry' is restored which stops photons and the electromagnetic force being a thing entirely. Keep pushing past that and a few billion times the Planck-photon length the energy density is so high that any bulk mass will collapse into a black hole. Masses with de-Broglie wavelengths on the order of the Planck length are possible, at least in theory., they'd have some interesting properties in regards to measurement.

@MrTripcore 8 лет назад

The temperature of the big bang doesn't exist because the effects of the hottest temperature is equal to the effects of the coldest temperature. There is also no need for a 'temperature' at all at the moment of the big bang because temperature itself is a type of measurement. You cannot 'compare' a single entity against another entity if that 'other' entity doesn't exist yet.

@leyawonder2306 5 лет назад

This video tied all the loose knots I had in quantum theory, thanks a lot!

@TheGuruNetOn Год назад

AWESOME!! This is one of the best explainer videos I've seen. 👏👏👏👏👏👏👏👏👏

@xgozulx 8 лет назад

thankyou so much for leting me understand the link betwen the vibratotion of the atoms and the radiation than an object emits. It was really pissing me off.

@ewanhassall7350 8 лет назад

Or as v-sauce would say... "Plunk length"

@Like34ninjas 8 лет назад

"hey! v-sauce!"

@guitarheroprince123 8 лет назад

"But who is Micheal? and how much does 'here' weigh?"

@guitarheroprince123 8 лет назад

+Ender Haha, man I know who he is. I'm just continuing what he says in his videos.

@ruisilva5758 8 лет назад

As always...thanks for watching...

@guitarheroprince123 8 лет назад

"@tweetsauce"

@psychyouout709 4 года назад

I'm glad to see PBS never lost its mission to educate. Thank you.

@JasonJason210 5 лет назад

This is one of the best so far!

@Harryandleo 8 лет назад

i keep watching these videos thinking i'll get smarter. so far nothings happened

@pbsspacetime 8 лет назад

As much as we try to pack into these episodes, you're not going to learn quantum mechanics from a RU-vid video. However you can gain some insights to guide further reading and further watching (and re-watching).

@Harryandleo 8 лет назад

I've just checked and I'm pretty sure the fault lies at my end. Exceedingly high cranium bone density, although....... not quite as thick as a Planck

@KaizerSozaye 4 года назад

Harryandleo yeah I guess it doesn’t work like that...

@conorm2524 3 года назад

@@Harryandleo Don't worry. We are in the vast majority.

@jumper7625 4 года назад

70% edgy kids that came from stranger things 30% Actually quantum mechanics forbid this

@SweatFPS 4 года назад

Jumper Memer cuantum

@5mamiya 4 года назад

I’m in the 70% LOL

@tylerhaverland9026 4 года назад

One of my friends pressured me if I knew this and I was like no???? So now I’m here

@thombruce 4 года назад

@@tylerhaverland9026 Well, if you're going to be peer pressured into anything, quantum mechanics is... Who am I kidding? Listen to your parents: Quantum Mechanics, NOT EVEN ONCE!

@Max_Le_Groom 4 года назад

People who get Their science knowledge entirely fed to Them *from TV* sicken Me

@kaufmanindustries5538 6 лет назад

The best explanation on the subject I've ever heard.

@johnhuldt Год назад

Best video I’ve seen on this topic. Thank you.

@accadia1983 Год назад

So, a full round circle of seven years rediscovering advances im physics brings me back to pixels, like whaaa? It's like welcome back to Matrix, Neo, except this time the pixels are spinning, rotating (referring to Higgs particles) and there is more to the whole rabbit hole thing

@bohanxu6125 3 года назад

3:03: "everything in the universe glows with its own internal heat" dark matters: how about no?

@buttlesschap 3 года назад

dark matter is fudge factor

@gaminghunt5837 3 года назад

Event horizon?

@hackerulroman 3 года назад

Because it's not a charged particle

@KauanRMKlein 7 лет назад

I didn't know that story about Planck's desperate move haha! We aren't taught the story like that in school. Awesome video, as always.

@ColinCarmody 8 лет назад

How are people already commenting? The video was posted about 7-8 minutes ago yet it is 15 minutes long!

@AnimeTheAmv 8 лет назад

Because for some reason being the first to comment is some sort of achievement for people? It seems trivial to me.

@petergimeno6547 8 лет назад

Didn't you watch the episode? The tortious can be overtaken, at the quantum level. Thus, comments can precede the video, at the quantum level of course!

@ColinCarmody 8 лет назад

+Peter Gimeno I'm sorry, but the comment section of this video does not look like the quantum level to me.

@petergimeno6547 8 лет назад

+Colin Carmody Yes. Apparently it lacks humor too.

@calebboud90 8 лет назад

The same reason you commented

@AngelaGonzalez-sf1yx 8 лет назад

this is a weird question but something that is very could would it give off in the radio wave spectrum? if so would there be a way to "listen" for it. i wonder what it would sound like.

@garethdean6382 8 лет назад

Yes, but VERY cold. 1K objects emit mainly micowaves. The emission rate becomes incredibly INCREDIBLY low, wile regular radio equipment would work, the signal would be incredibly weak.

@danielmunoz-lifeideas5124 6 месяцев назад

Finally a well put together science video, and i love you pace, keep it up brother!

@tonyreyes8190 7 лет назад

Wish you were my physics teacher in college. I remember this from class but I've learned so much and the constant makes so much sense!

@WiscoDrinks 8 лет назад

the flat earth tortoise is awesome.

@robertvanpiggelen4625 5 лет назад

Google Sir Terry Pratchett's Discworld

@manfredpseudowengorz 5 лет назад

5:01 Not so fast You PBS Space Time Peepz! Max Planck presented quantized EM force postulate on 14th of Dec 1900 - two weeks before the end of the 19th century.

@Moses_VII 5 лет назад

You mean 1899?

@philjamieson5572 4 года назад

So well explained. Thanks.

@DV-xf5yf 10 месяцев назад

Excellent video. Thanks!

@garypalmer997 8 лет назад

WOW! so psyched that you used/answered my question. Thank you😃 I like watching your guys shows even though I don't understand most of them😁 thus hence my question lol. keep up the awesome wrk ☺

@nightinqs 5 лет назад

SPOILER: Another alternative way to find Plancks Constant is to sing in front of a radio where a ton of people are listening whilst being chased by the Mind Flayer and trying to close a gate with a Russian machine in a small town in Indiana, making your smart hot girlfriend happy. And then she will say Plancks Constant just like that, and the world will be saved again!

@spaaaaace8952 5 лет назад

Nice spoiler., but that's irrelevant.

@nightinqs 4 года назад

SPAAAAACE If you watched most of season 3, you can make out most of this. Episode 1, Dustin tried to talk to her girlfriend, there was a scene of a gate opening with Russians, people know about Hawkins, the Mind Flayer returns. The only thing my comment is spoiling is the singing in the last episode with Plancks Constant being revealed.

@shardsofcontent4829 4 года назад

Welllll I don’t know. Sounds too convenient.

@nightinqs 4 года назад

Alright, don’t want to piss people off, so I’ll play it safe:

@PlagusTheImposter 4 года назад

Your Average Strategy Gamer haha

@manuhernz4431 7 лет назад

Let's rock in the quantum level. Thanks, great job!

@JohnnyYenn 7 лет назад

Beautiful, once again :)

@heinrichgoebbers2234 8 лет назад

"Einstein saved the phisycs as usual" Damn, that guy is the RL superman of nerds.

@irokosalei5133 3 года назад

Except that time when quantum entanglment won.

@xionpentagast 8 лет назад

given that I have a natural glow does that mean im a super saiyan?!

@AntonioBarba_TheKaneB 8 лет назад

yes, you are over 9000!

@garethdean6382 8 лет назад

Are you a blue-eyed blonde?

@DvDick 8 лет назад

Or you just ate radium

@valeriobertoncello1809 8 лет назад

+Silvio You are nauseating... ..detto da un italiano.

@KevinP32270 8 лет назад

MIND BLOWN.

@Bubbalubagus 5 лет назад

This has to be the greatest explanation of this stuff ever.

@marcellorossini5490 2 года назад

Thanks for the perfect explanations. You are an excellent communicator of concepts that are truly out of everyday life. I am just an engineer but with a degree taken 30 years ago. My physics texts lacked a lot of things that are now taken for granted. In my time, exoplanets and higgs' bose were not discovered and it was still almost science fiction to talk about black holes and multiverse. Personally, I believe that if we can study and fully understand the fabric of space at the Planck level, then the human species will be able to manipulate gravity and also allow us to travel among the stars in the blink of an eye. Thanks again and keep informing us.

@jluna8715 5 лет назад

What Planck came up with is so beautiful. An equation for the absolute smallest unit by mathematical definition.

@whatthefunction9140 8 лет назад

OK was not expecting to get my comment featured... My wife is going to freak when we chill tonight.

@supersonictumbleweed 5 лет назад

A friendly bi-annual reminder this happened

@winstonknowitall4181 5 лет назад

@@supersonictumbleweed I'd like to check if they're still together, but I don't want to collapse their wave function.

@kdeuler 6 лет назад

Great lecture from a great series. Thx.

@walidnouh1747 7 лет назад

awesome and rich presentation on planck constant

@TheTrackRecord 8 лет назад

I have a question. Imagine a laser pointing into space. In order to get the laser light to move the same distance (say 1cm) to the left further and further from the source would require a smaller and smaller rotational movement of the emitter. there must reach a point down the laser beam that in order to cause a movement of 1cm would require to emitter to move a distance smaller than the planck length. If the universe is divided into a pixel scale then how come we don't see a laser at a distance moving sideways in defined steps?

@TheTrackRecord 8 лет назад

Thanks for the response +eye of amber. my observation though is that because the same rotation in degrees of the laser emitter causes a greater and greater movement of the laser the further from the source, that at a great enough distance it should theoretically become noticeable. I understand that in reality this doesn't happen I'm just wandering why? Also anyone know of the questions answered on the next episode are randomly picked from the comments?

@garethdean6382 8 лет назад

No, the reason for this is that the laser photons have their own uncertainty based on their wavelength and the uncertainty principle. As the beam leaves Earth it MUST spread a certain amount, the photons cannot all be moving in exactly the same direction. (Or have the exact same energy\wavelength.) As the steps become smaller and smaller (And your 'detection distance' larger and larger.) the beams seem to 'blur' into each other. For visible light this tends to happen a bit above the nanometer scale.

@garethdean6382 8 лет назад

***** Wavelength does affect a lot of things and does set some limits to accuracy. If you could create a 'perfect' laser beam then wavelength would be the only thing limiting accuracy aside from your detecting equipment.But there is also uncertainty in the photon generating mechanism itself. A simple lightbulb is equally imprecise no matter what color of light its filament emits and any laser generates light with an uncertainty in its frequency and position. Though small on our scales (For pretty much anything you can treat a laser as being perfectly monochromatic for example.) such effects become dominant when you try to search for Planck-level effects or even when trying to make a focused beam of gamma rays.

@kcwidman 8 лет назад

So when a star collapses unfathomably quickly and produces a black hole, does the black hole never stop shrinking until it gets to the Planck constant? Can it shrink beyond it? And for a incredibly small amount of time, as the core of the star shrinks beyond its event horizon, is the singularity not actually a singularity but a big ball of mass just out side the event horizon that quickly shrinks and shrinks maybe forever, or maybe to the Planck constant? Been think about this for a while. Would love an answer! Thanks!

@flaviusclaudius7510 8 лет назад

General relativity predicts the star collapses to a singularity, but this ignores quantum effects. In order to know what really happens we need a theory of quantum gravity, which hasn't been invented yet.

@bantaar 8 лет назад

What happens inside a black hole is basically unknown. We use to say that the laws of physics as we know them break down inside a singularity. Even at the event horizon outside a black hole itself, time stands still as seen from the rest of the universe. The whole thing won't collapse to such a small size until more than an infinite time has passed. That is, until after the end of time. We don't have a deeper understanding of what's going to happen "then" (a word that doesn't even make sense in the context), so I don't think anybody can really answer your question.

@frankschneider6156 8 лет назад

+Natasha Taylor There is no singularity in physics. A singularity in physics is just a mathematical artifact, that appears when formulas derived from a model are applied to a situation were the model is no longer valid. This just means you need a better model (in this case quantum gravity)

@flaviusclaudius7510 8 лет назад

Frank Schneider Isn't that what I said?

@frankschneider6156 8 лет назад

Natasha Taylor Well I thought not, but if you meant that or i misinterpreted what you said, so be it, as we obviously seem to perfectly agree upon the fact. BTW, i first thought it was opisthoteuthis adoribilis

@Ben_D. 7 лет назад

Thank you for these!

@kittykatBflat 4 года назад

Really clear explanation thank you.

@nocturne9257 8 лет назад

Why are there no green stars if green is in the EM spectrum?

@IsYitzach 8 лет назад

Because black-body radiation follows a specific curve through color space shown in figure 2 on the wikipedia page on the topic. en.wikipedia.org/wiki/Black-body_radiation#/media/File:PlanckianLocus.png

@minimooster7258 8 лет назад

I'm not an expert, but I think it's because green ends up being absorbed (kind of) into the other colours. Well not really absorbed, but green wavelengths interact with other wavelengths in a way that the stars appear to be other colours. The sun's wavelengths actually peak in the green part of the spectrum.

@IAMN0TGAY 8 лет назад

Very simple, because there is no known star that burns at the corresponding temperature. For a star to be formed, it needs to have at least a certain amount of mass and that mass causes the star to burn at temperatures that don't allow for the emmitence of green light.

@potato-hj9nm 8 лет назад

+minimooster What about non visable light? Are there some stars that we can't see?

@IsYitzach 8 лет назад

potato 123 There many astronomical bodies we can hardly see because they are so dark and red. I think some are classified as stars. There are temperature classifications for stars beyond OBAFGKM that were taught once upon a time. The search terms you're looking for to find out is "Brown Dwarf" and "Red Dwarf."