Physicist Explains Lasers in 5 Levels of Difficulty | WIRED 

it's funny because your comment have 143 likes and the video has 147 dislikes.

@@mhj4867 rn the comment has 161 likes on both comment and video,,

Lol, i liked the video thoooo

its true i did it

I'm still waiting for this channel to ask me to explain "How to make Authentic Mexican Tacos" to 5 different levels of difficulty, LOL! I'd kill it.. jaja

Duch an underrated comment Lol

oh no, not this meme again

@@xarmanhsh2981 is this a meme

More like **Slaps backhand against palm** "This bad boy can fit so many photons per square centimeter"

Badum tss

and that's one of the reasons why you will never be even close to have a NOBEL prize.

@@K40L4 Not even one of the top 100 reasons though!

Don’t worry her reaction to it hasn’t been too different. Winning the nobel has really gotten to her head. Source: first-hand observation

@@missolympiabinewski She is clearly better at research than education. I don't think her demos left the young children with much more than a gee whiz moment that they got to meet somebody that all the adults are impressed with. The 8 year-old was told to watch out for the flashing red lights at the grocery store and the 12 year-old thought that lasers could be "any color" and that their primary characteristic was to deliver a highly concentrated punch.

Markle2k agreed. This is the worst iteration of “expert explains”. She described it as a challenge at the beginning... and then proceeded to fail.

F

thats because waterloo is a trap

that's because she is a horrible teacher. She's smart, but teaching isn't for her.

F

Feridun

Like a Sheldon.

@@UncommonSense-wm5fd what's this supposed to mean?

@@UncommonSense-wm5fd okay but isn't that how all govt funded research works?

burning a cancer cell using a laser is actually a nice idea

I am the 666th like on this comment if anyone cares.

yu fony man, be praud of yuself

Flyte you offended me

“Tween” oh wait that’s why they’re called that :0

Flyte you are very correct

Twelve-teen

Laser Legend is something I would definitely write in my business card

her expression also changed

underrated comment 😂

Yeah that kid will go on to fail her class

Obvious

( ͡° ͜ʖ ͡°)

That sounds weird...

Why does that sound... inappropriate? O.0

I was watching the one on Gravity, and the 8-yo kid was smarter than half the adults I meet. Like, you could stop twenty people on the street and ask them what causes the tides, and half of them would ask you what the word "tides" means. >_

@@verenigingvandemagogen4548 where you hiding funny bro?

DRAVY *SMAK*

15:31 makes me feel oddly dirty

Great now that's all I can see!

smack that hand!

Smack that electron. Smack it good! 😂

I don’t jive, *I boogie*

@DiCi Abadines, It's sometimes known as the Feynman Technique, first articulated by Richard Feynman - a great physicist a great teacher, and a wonderful, funny human being.

🤣😂😂 that’s funny

Best quote ever!

Cute eh?

For a child: a laser, one of many

I think that was more for us than for them lol. Hey, I need the visuals haha.

For an expert: sTAr wArS

chirped means that the frequency shifts in the pulse.

@@LockenJohny101 Chirped pulse amplification is a technique for amplifying an ultrashort laser pulse with the laser pulse being stretched out temporally, then amplified, and then compressed again.

@@TiberiusStorm the question was what chirped means. Also I have never heard the term chirped pulse amp for what you just said. But I might just have forgot it. It also isnt necessarily used on ultrashort pulses is it?

I could tell she was super smart when she could not really dumb down what she did to kids so well.

and the child. no prep.

@notfiveo still a 12 yr old

@notfiveo What’s Mensa?

very bright

laser sharp kid

@@danielsayre3385 lol

Yeah he was genuinely interested and curious. It was cute 😊🫶🏼

Okay, this is the best comment in this thread.

No real lasers are more like “zzzzzzt!”

Well I mean... 5:53

@Nathan SindlingerWell, the Jedi are supposed to be peacekeepers. Emphasis on supposed to be...

Yall realise she has a Nobel prize in physics and not a Peace prize right…

Lightsabers' blades are made of plasma, they aren't lasers. Like most of the blasters in the SW universe.

Combining multiple smaller lasers into one big laser sounds more Sith to me (ala the Death Star).

Beat the devil out of it

THOSE ELECTRONS, gotta SMACK them off the atoms😂😂😂.

exactly what I think

My dear, stop exposing how stupid you are to the world. Btw, i swear i saw you in commenting in scmp hk riot news video as well, or i might be wrong.

Nash you need to chill my man lol

@@NashTheGreat lol just look at her Playlist, this girl is f@#&ng smart, she knows a lot of things that a normal person wouldn't even question. She's most likely joking. 😂

@@bowzobetsiq4945 stalking people's feed is not my style.

@@NashTheGreat says the one who posts videos so people can see their channel. Lol jokes on you.

FBI!!! OPEN UP!!!

@@Overneed-Belkan-Witch Your reaction to the OP says a lot more about you then his comment did about him.

John Behrens Pretty sure it’s a meme but go off I guess?

Calling little kids cute means pedo nowadays...

Yes!!! She's adorable!

Well she seems to think about forgoing the moon. Both in power needs and size :D

He blurred for a moment looking at that nail

Hahahahaaahaahaa lol that’s what i was thinking

Hahahahaaahaahaa Lmaoooooo

Ok boomer

BOOMER ALERT!!!!!

Apparently she isn't, there's a lot of angry people here who failed her class 😂

@@josephblattert6311 ehh, could you elaborate? I don't think i understood your comment correctly.

@@bleflar9183 you mentioned that you didn't think she was a good teacher and I was confirming your suspicion because a ton of people in this comment section took her class at University and failed it

@@josephblattert6311 Oh, ok.

Yeah she tried to convey to the little girl that a laser is small by comparing it to her huge hair 🤣

Physics isn't that hard to understand..... once you've got a solid decade plus of math study behind you!

@@SoundSpeeding yeah that i don't have

@@SoundSpeeding If something needs a decade of anything to be easily understood, it's not a hard subject to understand.

@@cevcena6692 "If something needs a decade of anything to be easily understood, it's not a hard subject to understand." So you are agreeing with me ;-) And a decade of math studying is NOTHING (I was definitely underestimating that....)

@Gian Fernandelz It is easy if you want to learn pop science or school physics bill nye tier. Lots of physics is basically high level maths differential equations, tensor calculus that you have to understand, good problem solving abilities, and also a bit knowledge of chemistry. It takes years to really get comfortable with it

ATinyWaffle 😭😭*applauding*

On point😏

Shut up. Who cares.

@@verenigingvandemagogen4548 if a storm trooper or Jedi played "laser" with your cat, you'd care too! 😭

@@pondboy3682 OK

What about it didn't you understand? Even with her colleague, the idea of compressed energy and the Schwinger limit was fascinating!

Looks like we ve got a nobel prize winner here

yeah at no point did she explain why her lasers have a continuous spectrum. For all i know emission lines are pretty set in stone

@@joshwilliams8863 r/iamverysmart

@@majorfallacy5926 yeah I do kinda wish she talked a little bit about optical cavities. To give a rough idea of why the same laser could have more than one color, think about a wind instrument like a flute. A flute has a fixed cavity length but you can get lots of notes out of the same instrument (ie colors in a laser). However some notes will sound nice and loud out of a flute and others will not. For the loud notes, you'll find that if you take the length of a single wiggle and make a bunch of copies, they will fit perfectly in the length of the flute. The same thing happens in a laser cavity and by finding broad gain media you can put energy into some of the other 'notes' of the laser.

Why

@@pomegranatechannel pi =3

Wrong, pi is a constant and therefore basically 1, same as cos(x)

@@khizarpasha6105 e=π=3

She said got not had

They had one job

don't forget eleventeen

two teen

Firsteen, seconteen, thirteen, fourteen, fifteen...prove me wrong! (No dictionaries, please! 😬)

*stimulated

@@cptcaps2405 you're right. It's stimulated not simulated

The precursor to laser was maser, with the ‘m’ being microwave. Scientists at the time couldn’t find a medium to stimulate optical light but were able to do it for microwave.

The man's name who pioneered lasers? Albert Einstein.

Agreed, she's quite insufferable here. You could play a drinking game with the number of times she says "Nobel Prize." I also really enjoyed the quantum computing video, and I absolutely loved the video about gravity. The scientist featured there is approachable and enthusiastic, and even though the concepts became so complex by the end that it was difficult for me to really understand what they were talking about, it made me want to learn more.

I found all the videos interesting, but not all of them particularly educational. This one is the latter.

Ever had a teacher that did both? Spend all week explaining the introduction, and then assume you already know the rest? 😲

Ponderdeep yes, that’s exactly what some of my teachers are like.

13 year old boys don’t like science

I do

@@ricardoiturralde5337 Not all of them.

You’re all wrong except Hoi

At least in english.

Underrated comment

bye

Same!

So gorgeous 👑

Tell me about it

Hahahaha, I know, that's what I thought!

@@baderminahdin9450 that's because star wars isn't science fiction. It's fantasy. It's not trying be sci fi. Also they are not actually lasers in the star wars universe, more like plasma bolts. Though this is a later addition. But maybe tone down on the attitude and let people have fun with what they like.

@@baderminahdin9450 that might be one if the most stupid comments I've read today. Well done.

it's totally possible for an archaeologist to dislike Jurassic park, just look at the T-rex, they scream like a exaggerated auto-tuned lion roar..

@@baderminahdin9450 my Physics teacher (admittedly, not a Nobel laurete) is a massive sci-fi fan. I think it just depends on what you like, and if you can't suspend your disbelief, no matter who you are, you won't enjoy sci-fi/fantasy

Great for her. And she's impressive. But I didn't learn anything with any clarity.

I agree with this statement.

A zeroth level you mean?

Sound Speed! I mean, maybe the zeroth level is them introducing themself. It truly doesn’t increase your knowledge of lasers, perfect for 0 level

It's actually an unclear, unhelpful episode in a pretty good series. At what points in the video did you hear her clearly explain how a laser works? I missed that. I found it half a dozen other videos, but not this one.

You spelt laser wrong boomer

When the only laser in your house is 2.5w death ray

Im not a boomer i’m gen z and i cant spell (i’m 13)

@Styropyro Styropyro!

@@vertex3243 sadly for you, that's not gen z

It means "ionizing" the vacuum with electric fields so strong, that an electron is pulled out of the Dirac sea, creating an electron positron pair, an analogy to dielectric breakdown of say air. However the Dirac sea picture is problematic, because it does not explain anti-bosons, as bosons do not follow the Pauli Exclusion principle necessary for the electron Dirac sea. And then there's also the question of spin conservation. In modern physics, it has a better explanation known as pair production, where two photons are converted into an electron and positron. The photons have to get very close for this to happen, and so you are more likely to see it in sufficiently intense light. They also call it "photon-photon" scattering, because light can scatter off of the electron and positron after they are momentarily created, so it appears as though light is scattering off of light. It's not going to destroy the universe, because as soon as electrons and positrons are created, they are attracted to each other and will annihilate each other to return to conditions we began with. It's not the same as the "false vacuum" idea, where the vacuum as we know it might decay to a lower "true" ground state and destroy everything in the universe.

@@cryora Thanks for that detailed answer, and for reassuring me that it's not going to destroy everything in the universe. Is it an energy density that is great enough to create a miniature black hole though?

What is the name of the limit she mentions?

@@cavalrycome No, black holes are formed due to large amounts of mass packed into a small point, so large that gravity overcomes the strong bonds that give nuclei their structure. You may be able to drive nuclear reactions with intense lasers, but in that case, the nuclei will tend to explode outward, rather than inward. To force nuclei together is very difficult, because you need inward uniform pressure everywhere, otherwise the collection of particles would burst out of regions of low pressure (imagine squeezing a water balloon with your hand, eventually the water balloon will burst through the gaps between your fingers). This is a difficulty that scientists working on nuclear fusion are discovering. Miniature black hole creation using this approach is orders of magnitude more difficult, especially since you have so little of the main ingredient necessary for black holes, which is mass. The most energetic particle collisions (which occur in outer space and are a lot more energetic than even the most advanced particle colliders) do not come close to creating miniature black holes.

@@mmarcelocarnaval The Schwinger Limit.

the school is a trap

How? Could you explain because I plan on going here for engineering

@@nabihah2674 hahahha

DaDorn666 ..??

@@XtraBrad you rang?

Depending on your application, you sometimes don't need a high intensity. There are cases where you only need a special wavelength or an extremely narrow spectrum. So I guess there are experts for these kinds of lasers

Quantum optics to study the behaviour of single photon beams has really cool applications in quantum computing and entanglement. This is in contrast to a high intensity laser where there are so many photons it doesn't even make sense to refer to them anymore.

She kinda has a Nobel prize in that field but who cares right?

@@hs9577 - She's made it a point to let everyone know. lol

Yes, physicists who study ultra-cold atoms use ultra-low powered lasers to minimize the speed of atoms those last few milikelvin.

same thought.

Thought the same!!! If I was the kid I would had walked away thinking that the register will cut my items and burn my skin off!!! Not clear at all

"We do what we must, because we can." :)

I was looking for this comment! _[Also, first time I typed that sentence. Yay! Milestone!]_

Spot on.

And thanks for your gratuitous use of props! (-:

Explain "freezing lasers" to Dr. Horrible. BAD HORSE, BAD HORSE, BAD HORSE IS BAD....

Aperture science confirmed. Portal gun is in the works.

Cow dung.

Maybe because she asked for math, and got a slinky! 😑

@@giantworm4699 Yeah, it was hard to understand her explanations either way. She's a genius but not the best teacher perhaps.