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Lecture 1 | New Revolutions in Particle Physics: Basic Concepts 

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(October 12, 2009) Leonard Susskind gives the first lecture of a three-quarter sequence of courses that will explore the new revolutions in particle physics. In this lecture he explores light, particles and quantum field theory.
Leonard Susskind, Felix Bloch Professor of Physics, received a PhD from Cornell University and has taught at Stanford since 1979. He has won both the Pregel Award from the New York Academy of Science and the J.J. Sakurai Prize in theoretical particle physics. He is also a member of the National Academy of Sciences.
Stanford University:
www.stanford.edu/
Stanford Continuing Studies Program
csp.stanford.edu/
Stanford University Channel on RU-vid:
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26 сен 2024

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Комментарии : 838   
@WXMaven
@WXMaven Год назад
I can only repeat what so many commenters have already said: Thank you Stanford for hosting these free lectures, and thank you, Prof. Susskind for preparing and presenting these lectures. Stanford and Prof. Susskind are gifts to the world.
@420SanJuan
@420SanJuan 12 лет назад
you know the world is becoming a better place when education is essentially free. thank you Stanford!
@HenrikSultan
@HenrikSultan 14 лет назад
I don't think this has been said enough, thank you Standford for these free lectures. Thank you!
@mikikaboom9084
@mikikaboom9084 Год назад
Susskind: Speed of light is very large and Planck's constant is very small Also Susskind: Let's set c=h bar=1
@universalsailor
@universalsailor 13 лет назад
I'll tell you what I like about Lenny: he keeps it as simple as it can possibly be kept. For him there's none of that deliberatey jargon-drenching, I'm-smarter-than-you crap that marks out the lesser mind. He loves the subject. He keeps it simple because he has to think about it and, in that, simplicity is always going to be his friend. He really likes to tell people about what he's been thinking about, and he can spot a fool at fifty paces. Great shows, Maestro.
@dannyaguirre4814
@dannyaguirre4814 2 года назад
I saw this attitude represented by a few of the students in the video as well. Made me chuckle. This is only their first lecture- their questions were valid but their approach were filled with hubris of the ignorance. The wise man knows he is a fool
@tamasmihaly1
@tamasmihaly1 2 года назад
So many professors ban all recording devices from their lectures. Mr. Susskind is a saint. He hands out gold freely like it's nothing to him. What a man.
@schmetterling4477
@schmetterling4477 2 года назад
I have never seen a professor who did that.
@ColeMyersK
@ColeMyersK 8 лет назад
Pretty incredible what the internet can do for those seeking a world class education.
@justice5776
@justice5776 6 лет назад
And its sad how this still has less than 400k views over 8 years later.
@eduardos.366
@eduardos.366 6 лет назад
Susskind has so many lectures online. Thanks Leonard!
@youteubakount4449
@youteubakount4449 5 лет назад
Maybe, but this isn't it. 2 hours to give 2 constants and babble... too bad. At least some other videos are more interesting
@CalvinHikes
@CalvinHikes 4 года назад
Many try but no one knows particle physics like Susskind
@brucesvondo8315
@brucesvondo8315 3 года назад
Try ttt
@aqouby
@aqouby 13 лет назад
This man is ridiculous, I love everything about him. Not only does he have amazing intelligence and a very simple way of portraying his ideas, but he is funny and honest and-- And damnit, the man fought Hawking and won, in a ways. He's one of this centuries great theoretical physicists. Just wanted to give my 2 cents.
@annymus4502
@annymus4502 3 года назад
May I ask you guys something? So, I don’t know much about physics, but I’m planning a WEBTOON and I wanna make it about these two people...one is able to create energy and another one destroys it I KNOW YOU CANNOT MAKE ENERGY OR DESTROY IT, OK, BUT IT’S FICTION So...I figured the person who destroyed energy could make things levitate (destroying the force of gravity) and freeze things (destroy kinetic energy), but Idk what other powers I could come up with And I have no idea what energy creation could bring, I suppose you could make things move to your wish by creating force on them and you could melt stuff but Idk And what could they do together???
@akhandanand_tripathi
@akhandanand_tripathi 3 года назад
@@annymus4502 creating energy may lead to a power of move anything from anywhere, increasing kinetic energy and having ability to emit radiations of any wavelength, as wavelengths are just energy
@annymus4502
@annymus4502 3 года назад
@@akhandanand_tripathi Ok, thanks
@yashbush7145
@yashbush7145 3 года назад
@@annymus4502 o
@nadzach
@nadzach 3 года назад
@@annymus4502 it's interesting that wisdom as old as Moses places the "Proton" at the center of 3 shells. The Proton is a king and his throne is called "The mercy seat." The shells are called "courts." Outside the courts is darkness and the evil one who hates, destroys and kills. The Proton is merciful, good and loving. He "draws" people into the outer court with "cords of love." No real cords but the magnetic power of love. The people of the enemy don't understand. The are rebellious like the evil leader and rage in anger wanting to cut the cords or "cast them from us." Each person has 3 main parts (like quarks.) In each court he gets more oil for his lamp and grows brighter as he approaches the Proton. The evil one uses deception (like fake news) and outright lies to call the man back to him. If he can get the man to "doubt" the truth, the man fall back and loses some light and power. It's very interesting that the old literature names each man in the courts an "electon." The evil one wants to steal the man's oil. In the first court his first quark is "quickened"--he is enabled to love his family and the desires of his heart turn toward good. (This increases as he moves forward until he can love even his enemies. The evil one tries to cause disruption--like maybe he entices the man's wife to cheat on him. He lays "snares and traps." There's a lot more. The pathway of the electon through the shells is called "the way of life." The second quark is about the man's ability to work--whether it's military or any kind of labor inside this kingdom. The third quark is the quickening of the mind. After those 3 (trimesters) there are mystical abilities. There are an octave of steps and with the 8th he returns to the outer shell where he teaches and serves the beginners. Iron can't hold him. And he can move from place to place quickly without being seen. He hears the lightning speak and he can hear/see into other dimensions. He can heal.
@AmarThakuri
@AmarThakuri 6 лет назад
One of the living legends. Everytime I fallow his Lectures, I learn the thing so easily and it motivates me time to time...
@joabrosenberg
@joabrosenberg Год назад
Intro and history of radioactivity; Quantum mechanics 41:30; relativity 56:00; dimensions and units 1:05:05; momentum 1:33:00;
@UncertainHeisenberg1
@UncertainHeisenberg1 7 лет назад
I have degrees in chemistry and physics. I jokingly looked this topic up and found professors that collated a significant amount of knowledge processed through a research project I developed. WTF is RU-vid!? The availability of knowledge is mind boggling to me, as well as inspiring. Knowledge shouldn't be limited to a person or family with more funds than another; knowledge, especially scientific in nature should be free for any person to enjoy.
@annymus4502
@annymus4502 3 года назад
May I ask you guys something? So, I don’t know much about physics, but I’m planning a WEBTOON and I wanna make it about these two people...one is able to create energy and another one destroys it I KNOW YOU CANNOT MAKE ENERGY OR DESTROY IT, OK, BUT IT’S FICTION So...I figured the person who destroyed energy could make things levitate (destroying the force of gravity) and freeze things (destroy kinetic energy), but Idk what other powers I could come up with And I have no idea what energy creation could bring, I suppose you could make things move to your wish by creating force on them and you could melt stuff but Idk And what could they do together???
@simplelife1021
@simplelife1021 11 лет назад
I like the part where he teaches particle physics to the entire world for free.
@danieldorsz1047
@danieldorsz1047 4 года назад
@@AndreCabannes thank you !
@RahulChaudhary-hh7gx
@RahulChaudhary-hh7gx 4 года назад
@@AndreCabannes omgosh thank you
@CosmophysicswithRTsir
@CosmophysicswithRTsir 4 года назад
@@AndreCabannes thanx buddy
@ajaykumarchavan8472
@ajaykumarchavan8472 4 года назад
@@AndreCabannes please nuclear physics
@kersi-sandiego6036
@kersi-sandiego6036 3 года назад
Andre, Big THANKS.
@sin-itirotomonaga3220
@sin-itirotomonaga3220 12 лет назад
Susskind is a brilliant scientist as well as a brilliant teacher.
@mattias2099
@mattias2099 13 лет назад
Love these lectures! (Speed of light is 299792458 m/s not 299762458 m/s.)
@HueyTheDoctor
@HueyTheDoctor 12 лет назад
I love how Susskind eats during the lecture and talks with his mouth full lol. If it were anyone else it might be annoying but with Susskind it's just endearing.
@ice9ify
@ice9ify 12 лет назад
So far i am working through all the lectures and they are all very well done. I think it is deserved that I show my appreciation to put this out there for us interested people to watch and learn from. Thanks alot Stanford, for me this shows you really take educating people as the core of what you are doing.
@beingnonbeing
@beingnonbeing 12 лет назад
I feel so pampered and spoiled being able to sit in bed with my jammies on watching this lecture on particle physics. It can't get better than that!
@IamMrDelight
@IamMrDelight 3 года назад
Lmao 8 years later, everyone is like this due to Covid. You my guy predicted the future
@gorgeannecharlos509
@gorgeannecharlos509 2 года назад
,yes...and a cup of coffee and why 2 🥧pie!
@go-away-5555
@go-away-5555 Год назад
Standford is so generous to put these online for free, and Professor Susskind is such a fantastic lecturer.
@bennyyarnold
@bennyyarnold 10 лет назад
Thanks so much. You've taught me so much at the young age of 14 I can hold conversations about science (most of the time I lose them in it) with people on the CMU and Pitt campuses on school field trips. All thanks to you Mr. Susskind!
@drajah1986
@drajah1986 10 лет назад
Keep it up! the educated minds are drastically reducing in populous, I implore you to advance your mind. It's a beautiful thing to understand concepts and think beyond a conditioned realm. Intellect where used responsibly can launch our civilization at light speeds into the future.
@mathsocraft7816
@mathsocraft7816 7 лет назад
Same Here My Friend. But My Thanks Is To The Whole Internet Of Things. At Age 13 I Know Many Things.
@UncertainHeisenberg1
@UncertainHeisenberg1 7 лет назад
Forgive me if I sound rude in saying this but, it's very presumptuous to claim you lose others in conversation about rudimentary particle(atomic) physics lecture matters. More so, that your confidence about the nature of the topic in general is validated by your so claimed superiority in the nature of the subject. There are a lot of beautiful mathematics that is involved in understanding the subtle intricacies of what modern scientists know today. Intuition, logic, critical thinking, and more importantly the desire to understand the process is what is important. This process takes time.
@nighthawkviper6791
@nighthawkviper6791 2 года назад
I gotta say, I appreciate Dr. Susskind for contributing to this open source but also to Stanford for providing an entire library of near-complete course lectures.
@mandjevantichelaar
@mandjevantichelaar 11 лет назад
Thank you very much Leonard Susskind and the University of Stanford! I am doing my final paper, for my pre- University education in Holland, about Bose-Einstein condensation and these lectures help a lot!!!!
@fibosxpivots6238
@fibosxpivots6238 11 месяцев назад
His grandmother was probably born around 1890. Thanks a lot , Master !
@lucasmelo010
@lucasmelo010 7 лет назад
Simply amazing. The edge of human knowledge been taught for free during 1 hour and a half. :) Thank you Standford.
@oldpain7625
@oldpain7625 Год назад
His lectures are so freaking dense. 40 minutes in and I need to start looking things up before I can continue listening without confusion. His advice to visit his content on RU-vid is wise. Thank you to everyone involved in creating and sharing this!
@yp06407012
@yp06407012 13 лет назад
@TirianB writing 2.99762458x10^8 instead of just 299762458 will help us know that the number has 9 digits all together. Othewise with just 299762458 one has to count the digits to understand its magnitude.
@03Kabbotta11
@03Kabbotta11 12 лет назад
Classical Mechanics - Statistical Mechanics - Special/General Relativity - Quantum Entanglement/Mechanics - Revolutions in Particle Physics - String/M-Theory....roughly. Enjoy! They are all amazing. And if you want more afterwards look up Balakrishnan's Classical Physics/Quantum Physics lectures...they are incredible and much more in depth.
@sghrd
@sghrd Год назад
Prof. Susskind lectures have to be elected for humanity world heritage
@MichaelHarrisIreland
@MichaelHarrisIreland 12 лет назад
I thought it was great, in content and style. I don't know what I did to deserve such dedication by some people who try to understand the world and then explain it to me.
@nobodyfromnowhere9731
@nobodyfromnowhere9731 11 лет назад
I like how he says you have to memorize Planck's constant, then reads it off a piece of paper ^_^
@alicetries5954
@alicetries5954 3 года назад
first two digits and exponent are all i needed to memorize i just also had to know that wasn't all but omg the one that really gets my goat is when a professor says there isnt a book for the class then sells you their pdf. always the skumbag hustle with so many profs i had.
@TimFSpears
@TimFSpears 3 года назад
Perhaps funnier is he did the same with c but mis-transcribed it.
@theindiefanclub
@theindiefanclub 11 лет назад
When you ask "what practical use" that is the moment that you stop being a scientist. Nothing fundamental has ever been discovered by asking "what practical use does this have". You find applications *later*, understanding the inner workings of the world around us is a worthy enough ambition.
@fsh3702
@fsh3702 8 лет назад
Great!The first time I had understand general relativity is from the lecture of Leonard Susskind. Before that I have watched many lessons and videos and books about GR, but all are in futility, I just cannot master the idea of general relativity, until I check Leonard Susskind's video, it's a blessing and truly an enlightenment.
@deyomash
@deyomash 12 лет назад
planck's constant is not h-bar, plancks constant is h h bar is the reduced plancks constant which is h/2pi
@TmyLV
@TmyLV 2 года назад
Leonard Susskind: One of the greatest physicist and physics teacher from our time, in the same LEAGUE as Feynman and other legends...😀
@KipIngram
@KipIngram 3 года назад
11:50 - What? The periodic table is VERY well organized. It's not "exactly" periodic, but it absolutely reflects the filling of different stages of orbital structure.
@motcenothman8247
@motcenothman8247 6 лет назад
Thank you Standford thank you L.Susskind for your wonderful lectures
@SarvParteekSingh
@SarvParteekSingh Год назад
Great lecture! Minor error at 2:15 - the atomic number of Helium is 2. Its atomic mass is 4.
@clearclearskies
@clearclearskies 12 лет назад
You're a gifted teacher. Thank you.
@Musicfromouterspace
@Musicfromouterspace 10 лет назад
I really enjoy your lectures. Thank you so much for posting them. Your explanations are always clear and understandable. Cheers
@bushje
@bushje Год назад
Thanks for keeping these up here! Loving Prof. Suskind. what a special guy!!
@AndraBullar
@AndraBullar 11 лет назад
Explain the double slit experiment using classical physics, and you have a Nobel prize waiting for you.
@OneNubNinja
@OneNubNinja 2 года назад
Every time I fall asleep and wake up in the morning and open my YT app, I’m on one of this guys lectures. How tf do i go from skyrim to this.
@Ubernoob85
@Ubernoob85 14 лет назад
Another thanks to Stanford University for the great (and free!) lectures. I had an interest in this subject but never dreamed I could get a lecture (from Stanford, none-the-less) for free.
@TheLaubum
@TheLaubum 10 лет назад
thanks alot, great stuff. I love how at about 1:42:00 something as simple as w = 2 x pi x f manages to confuse even the smartest of people.
@csmcmillion
@csmcmillion 13 лет назад
"QM is a subtle and difficult subject. Yet, in his QM series, he said "Everything in QM is easy".
@Just_lift_anyone
@Just_lift_anyone 10 лет назад
I love these lectures! Mr Susskinds accent reminds me of a Sopranos cast member, "Hey I'm gonna teach you about atoms or whatever the fuck!"
@tomekczajka
@tomekczajka 3 года назад
1:06:00 "c=2.99762458 * 10^8 m/s plus or minus something in the last digit". Actually it's exact as of 1983, since that's how a meter is defined. Except there's a typo, it should be 2.99792458.
@PaulO-gu3od
@PaulO-gu3od 12 лет назад
Interesting video, hats off to the lecturer, really enjoyable. A person in the audience asked why Planck's radians were measured at 2 times pie times frequency, my guess is that he looked at the field as a radiating circle first and then used the associated Math to express his evaluations. Thanks Leonard.
@JimmyGray
@JimmyGray 4 года назад
The undergrad pre med joke at 38:04 made me really laugh as an MD who attended that lecture :)
@jeremyburke6630
@jeremyburke6630 3 года назад
sick burn lol
@nietszche98
@nietszche98 12 лет назад
I'm tired of people saying how old they are. It doesn't matter; just watch the video.
@mayanksharma5516
@mayanksharma5516 7 лет назад
beautiful!!! Thank you Mr.Sussikind
@weishanlei8682
@weishanlei8682 2 года назад
You are my hero! I like your teaching style.
@mmartin5816
@mmartin5816 4 года назад
Thank you Lenny!
@ThePhysicsConnection
@ThePhysicsConnection 7 лет назад
We love you Susskind!
@ChickenSpeed
@ChickenSpeed 5 лет назад
this has better audio than the MIT lectures on YT, and that came out in 2015
@pakisium
@pakisium 6 месяцев назад
Watching after 14 years and still pleading on eyes ❤😂
@12388696
@12388696 11 лет назад
Be more considerate - he is in his seventies now. Imagine how many profs can explain this so crystal clear in their seventies?
@AmazingStoryDewd
@AmazingStoryDewd 5 лет назад
How does age effect how well you can explain something. I had elderly physics professors as well. They were articulate.
@numberJ5
@numberJ5 13 лет назад
I wish people would shut up and go to his office hours for explanation instead of ruining the lecture for everyone.
@KingArcturus
@KingArcturus 14 лет назад
forms of light, solids, liquids, gases, plasmas, variations in gravity, motion, energy and time all fall into this category. When it is said that the speed of light has limits, what type of light is referred to? If nothing can move faster then the speed of light. Sorry if this seems arbitrary. I am not a physics expect just a theorizer. Please feel free to enlighten me. I suppose you could try an experiment on mars simultaneously as on earth to prove the correct speed of light.
@AndraBullar
@AndraBullar 11 лет назад
You missed the entire point. Yes, transistors have been around since the 50's, and they were invented using quantum mechanics. COMPUTING can function without quantum mechanics, before the transistor we used electron tubes, but the MODERN COMPUTER would not have been possible without it. Todays's transistors are too small to be constructed without quantum mechanics taken into account. I would also be delighted to see how you deal with the century of experiments backing quantum mechanics.
@MarkCidade
@MarkCidade 11 лет назад
A lot of people with the gene for sickle cell anemia don't die of malaria, which is common in their area. That's why it's considered a good mutation. Genetic mutations can be both good and bad.
@life_score
@life_score 2 года назад
Amazing way of thinking 👏
@daanlib
@daanlib 12 лет назад
So when the filter has a certain thickness, the blob changes into little blibs?
@dhireshyadav1783
@dhireshyadav1783 4 года назад
Not just the idea but the video is also now ancient.
@GoodScienceForYou
@GoodScienceForYou 11 лет назад
Have you ever watched this "brownian" motion? If you are quick you can clearly see that it is not random. The movement is precise to the action / reaction. The best way to see this is to watch closely only one object. If you can write a program to show this as "science" does to illustrate this motion, then it is not random by the fact that it can be programmed.
@7milesdavis
@7milesdavis 12 лет назад
Why does this video have any dislikes? Thanks Stanford, great videos
@MrScieman
@MrScieman 11 лет назад
I like the way that each time a student ask a question, he grabs something to eat. :-)
@Aulvikdngr
@Aulvikdngr 11 лет назад
In science, there shall be always a need to ask a LOT of questions. That is one of the most efficient methods people use to expand their knowledge of everything. Aside from that, asking questions is a necessity for life. If you want to know, then ask! If you don't want, then don't lull people into your absurdity.
@johnboyd2564
@johnboyd2564 12 лет назад
He has a talent for communicating tough concepts. For those who
@EnochBrown-s5j
@EnochBrown-s5j Год назад
Absolutely brilliant lecture. Thank you, Professor Susskind!!!
@kavish2307
@kavish2307 4 года назад
"It's more a question of biology than physics" . Susskind is hilarious
@AndraBullar
@AndraBullar 11 лет назад
What you seem to have a hard time gripping is this: Quantum mechanics is a MODEL describing the behaviour of atoms and subatomic particles, and it has passed all experimental obstacles for a century. These are the only things important. A model does not have to be a perfect representation of reality, the only important feature is that it can make accurate predictions. Newtonian mechanics is not perfect and does not make perfect predictions - but it works in the scale it was meant to be used.
@GoodScienceForYou
@GoodScienceForYou 11 лет назад
I have no arrogance, and I have been a scientist for over 47 years. All of my projects actually work.
@sandrocavali9810
@sandrocavali9810 Год назад
My favorite hero. Dr sussnind
@chuckmaddison2924
@chuckmaddison2924 4 года назад
At what point does the color of an object vanish as you break apart the object into smaller and smaller parts.
@MarkCidade
@MarkCidade 11 лет назад
In statistics, something is random if it is nondeterministic and it follows some probability distribution. That describes quantum phenomena, including radioactive decay.
@MarriageArezou1
@MarriageArezou1 3 года назад
Great teacher. Thank you so much for free sharing.
@1Fasterblade
@1Fasterblade 12 лет назад
I know where he got the units but, where did he get that value of h? ...1.05455...*10^-34?
@rachaelranney4746
@rachaelranney4746 6 лет назад
I wish there more people like him doing lectures. I play Minecraft while I am listening to him.
@Pentazoid111
@Pentazoid111 14 лет назад
Is this the type of particle physics course that graduate students take.
@sauravgupta361
@sauravgupta361 5 лет назад
Anyone please provife me the best channel which explains basics concept of physics
@channel-ug9gt
@channel-ug9gt 3 года назад
Answer for 1:28:12 : e^(-iw) is in the Fourier transform, plane-wave equation, Schrödinger eq, etc... 1=e^(i*2*pi)
@GoodScienceForYou
@GoodScienceForYou 11 лет назад
"Actually a particle is not energy, its is a point is space-time where an interaction is taking place, energy is moved about during these interactions." HEMG.
@davidwilkie9551
@davidwilkie9551 2 года назад
"It's always NOW", look and listen, in AM-FM Timing-spacing "nameless" cause-effect Totality. This is the first principles basic abstract reasoning concept for developing Actual Intelligence. If you aren't self aware in QM-TIMESPACE then "there's your problem".
@josephlau13d77
@josephlau13d77 4 года назад
1:06:21 isn't speed of light c equals to 2.99792458 x 10^8 m/s instead of 2.99762458 x 10^8(instead of 6 should be 9)
@Blindastronomer
@Blindastronomer 14 лет назад
Who the hell needs expensive books and bus fare when you have Leonard Susskind. :D
@jeffrey6244
@jeffrey6244 9 лет назад
Typo at 1:06 - the speed of light is 299,792,458 m/s and is now an exact figure (I have removed the error that was in here; thanks to Christian Farina for spotting it). Typo at 1:09 - he put an extra 5 in h-bar, as it is actually 1.054 571 800 x 10^-34 by the latest (2014) CODATA measurement. At 1:19, G=6.674 x 10^-11 Newton-meter^2/kilogram^2 (that's all the accuracy possible at this time)
@christianfarina3056
@christianfarina3056 9 лет назад
+Jeff Rey So a meter has been redefined to be 300,000 kilometers?
@jeffrey6244
@jeffrey6244 9 лет назад
Christian Farina Here is a link to how these basic units have been defined over time: physics.nist.gov/cuu/Units/meter.html After reading about the meter, go to the definition of the second and it should clear things up.
@christianfarina3056
@christianfarina3056 9 лет назад
Jeff Rey My point was that the definition of a meter is not 'the distance light travels in one second.' That distance is 300,000 km, more or less.
@jeffrey6244
@jeffrey6244 9 лет назад
Christian Farina Ye gods, you're right! That was one spectacular goof on my part, so apologies. One light-nanosecond is a distance of one foot, by the way.
@AsifRaihan
@AsifRaihan 14 лет назад
Thank you soooooomuch
@AndraBullar
@AndraBullar 11 лет назад
EXACTLY. You don't use classical physics to describe electron behaviour, why? Because electrons and other elementary particles do not follow classical reasoning. They follow relativistic and quantum mechanical reasoning, as they operate on such a small plane. That is why the Dirac Equation, being a successful combination of quantum mechanics and relativity, did not only predict the existence of the positron, but also manages to make damn near perfect predictions, backed by experiment.
@maneabogdan1902
@maneabogdan1902 12 лет назад
Is the best and amazing teacher ever
@petergreen5337
@petergreen5337 8 месяцев назад
❤Thank you very much Professor and class
@KipIngram
@KipIngram 3 года назад
1:29:50 - Oh, come on; surely someone knows this. Using radians is simpler because 1.0 radians is that angle for which the length of the circular arc the same as the radius. So if theta is measured in radians, then "edge length = theta*r". Integrating angle d.theta from zero to theta gives you a length of theta.
@BowtieChameleon
@BowtieChameleon 4 года назад
i'm in 8th grade and watch this for fun
@coldironhands1
@coldironhands1 14 лет назад
thanks for putting these lectures up!!!! This is great.
@MarkCidade
@MarkCidade 11 лет назад
I'm not asking you. I was asking GSFY. He purports to know the answers to my questions.
@TheRealSeus
@TheRealSeus 11 лет назад
you might ask, why mr susskind can tell the history of particle physics as "it might have been" rather than "it realy was": well as a theoretical physicist he is allowed to do that ;)
@NeuroScientician
@NeuroScientician 12 лет назад
PLEASE PEOPLE, All those Physics lecures ~ I think there are like 12 courses available but I don't know in which order to watch them.
@GoodScienceForYou
@GoodScienceForYou 11 лет назад
What we see is billions of years in the past and past events long gone. The passage of a "black" hole is like a passage of extreme powerful gravitational pull like we have no idea about. What you see is the "wake" of its passage.
@GoodScienceForYou
@GoodScienceForYou 11 лет назад
The black hole is matter traveling at extreme speeds and so it is going away from us faster than the speed of light relative to our position in space. They are not invisible to people on the other side of them going in their direction.
@GoodScienceForYou
@GoodScienceForYou 11 лет назад
Electrons act like "particles" and "waves" because particles are actually made of pure energy contracted and formed into concentric circles of extremely short wavelength electromagnetic wave forms.
@MarkCidade
@MarkCidade 11 лет назад
If you can actually show that radioactive decay is based on the conditions of particles, you'd get a Nobel Prize. But that doesn't change the fact that the decay follows a probability distribution, which is how randomness is defined. No one has yet come up with any experiment that shows the cause of the apparent randomness and for now the probabilistic models have been sufficient otherwise.
@Kalles_Kaviar
@Kalles_Kaviar 9 месяцев назад
❤❤❤❤ good lecture , loved learning this class in 🏗🏗🏗🏗🔦🔦🔦🔦
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