Lecture 8 | Modern Physics: Quantum Mechanics (Stanford)
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Lecture 8 of Leonard Susskind's Modern Physics course concentrating on Quantum Mechanics. Recorded March 3, 2008 at Stanford University. This Stanford Continuing Studies course is the second of a six-quarter sequence of classes exploring the essential theoretical foundations of modern physics. The topics covered in this course focus on quantum mechanics. Leonard Susskind is the Felix Bloch Professor of Physics at Stanford University. Complete playlist for the course: http://youtube.com/view_play_list?p=189C0DCE90CB6D81 Stanford Continuing Studies: http://continuingstudies.stanford.edu/ About Leonard Susskind: http://www.stanford.edu/dept/physics/people/faculty/susskind_leonard.html Stanford University channel on YouTube: http://www.youtube.com/stanford
Comments
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(1:25) He said energy is momentum squared divided by twice the mass. The thing is, isn't a photon mass less? (dividing by zero?).
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If "time" varies as modern science says it does, then how could any physics formulas and any physics constants that deal with time, (especially even the "speed" of light, "speed" being distance divided by "time"; if time varies, speed would vary given the same distance), ever be fully accurate?
In addition: to me:
"Space" is pure energy itself. Wherever space is, energy is. Wherever energy is, space is.
"Time" is the flow of that energy.
Some in modern science currently recognize "time" being the "speed of causality". (Of which I believe to be incorrect in that they are utilizing "time" in "speed", [speed being distance divided by time], to define time, without really saying what "time" itself really is.
But, with whichever definition is utilized above, things probably happened very quickly during the initial big bang, are slower now, and with the continued expansion of the universe, (with energy that supposedly cannot be created nor destroyed and hence would be getting less and less dense), will be slower in the future. "Time" itself is probably slowing down but we don't notice it because we are inside the universe.
If space and time are not a direct one to one relationship, and time is slowing down faster than the universe is expanding, maybe that is one possible reason as to why we perceive the universe expanding faster and faster, (which really makes no logical physical sense in a universe whereby energy that could not be created nor destroyed would be getting less and less dense in an expanding universe). -
With the rotated photon scenario (ending at about 1:00 in the lecture), it does not take into account the electromagnetic interactions of the electric and magnetic fields of the electrons in the polarizers themselves interacting with the photon passing through it. Wouldn't this be the "why" the photon rotates?
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At around 42:30, The derivative of ae^-iET is aiE(e^-iET)..he forgot to include the exponential term e^-iT..it doesnt disappear and there's nothing to cancel it with..is he assumng it's small and neglgiible?
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AAAAArghhh bloody h-bars.
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Great lecture. But kept on thinking that the "special" or "magic" material is just a typical chiral substance. These are very common. You can have left or right handed materials, depending on whether they rotate the plane of polarisation left or right.
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someone again died at 3:20
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Sometimes, anywheres theres particles rambling everywheres. Somewheres, there's Susskind teaching me english. Just joking, I love the grammar Susskind uses. It makes his classes more vibrant.
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LoL, 1+1 = 1!
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Then I guess he didn't really understand when he first discovered it ;)
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what??? all that he is teaching is standard u can find a course like this in any university in the world. And more important you can read any book for undergraduate to check out Dirac's notation and all this stuff. I saw this notation in my undergraduate course based on cohen tannoudji's and sakurai's books, and of course as always, Griffiths book.
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From now on I try to be more like Prof. Susskind when I give a talk. He is a great lecturer, the way he clearly explains things, the way he chooses his material to present, and the way he presents it is just brilliant!
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this is about where i changed my major in college, lol.
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Einstein is alive! He's reincarnated in the body of Susskind!
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@mechapple Yes, when he FIRST discovered it. ;)
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developer.am
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@jalalmalo : that's ironic coz einstein wasn't able to explain relativity simply when he first discovered it.
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I heard that Einstein had said something like, if you can't explain it in a simple way then you haven't understood it. Proffesseur Susskind, you are a master. Thanx alot.
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Notice the quantum jump of the symbol = on the blackboard at 0.43.09 or 0.43.10. Very graphic.
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