Physics 10 - Lecture 18: Quantum II

[thantawa]

25% of the US economy is a bit of a stretch?

[CamiloSanchez1979]

You got me at "wave function"....lol

[hnb001]

Sound is poor. Should be louder!

[TheExtractor1]

@hnb001 Word!



[sn1pe352]

"Simplicity is the Ultimate sophistication "

Mathematicians in philosophical terms of plato are said to be the "Great organizers" NOT GREAT MINDS

The great minds were simplistic spontaneous natural improvisation artist musicians-philosophers poets etc etc

Never forget that

"Theres a big difference between knowing the name of something, and knowing something" Quantum Electrodynamicist richard feynman PhD Nobel prize winning theoretical Physicit

It's a Miracle Curiousity survives education

[twheeler76]

If the energy of a particular photon (planck's constant x frequency) is equal to 2ev, then doubling the amplitude will give you 8ev, not 4ev, since energy is proportional to the amplitude squared. So it would now contain 4 photons, not 2.

[benbubnick]

@twheeler76 energy of the wave packets is not proportional to the amplitude in any way, only the frequency.

[swasasheeru]

does a wavepacket have a frequency?

[greffin6]

@swasasheeru

yep and the energy is proportional to the frequency

[shahdil7]

This guy talks more than he knows. He spoke about color laser printers splitting light into 3 colors, but that isn't how they work. Also to contradict himself, just before that he said, on monochrome laser printers the black powder sticks to the charged paper. Hmmmm. He was right about monochrome lasers but not color lasers. Sorry prof. But lecture is excellent!!!

[sergheiadrian]

I have to say, this lecture is probably one of the best things on Youtube!

[samfisherkiller]

This is basic physics. This is not at the graduate level. He did not even require them to know Planck's constant = 6.626068 × 10e-34 m2 kg / s. I remember my physics teacher stressing this number :D

[joser006]

string theory is the shit.

[nickharvey7]

We have the Lorentz contraction of the geometry of spacetime relative to the mass or energy of an object therefore time must be a measurement and a variable. Could it not be possible that at smaller and smaller distances and shorter and shorter time scales this variable could also be the Hidden Variable of quantum physics? Could this explain randomness at the quantum level?

[benbubnick]

@nickharvey7 no

[gymgymgymgym]

what is he saying at 00:22?

[coolestdude80]

Leon Lederman. Nobel Laureate. He won the Nobel peace prize in physics for his work in Nutrinos. He is/was a bigshot at Fermilab.

[coolestdude80]

@coolestdude80 Not a peace prize. Just a prize for physics.

[gigagagugu]

but if you have two componentwaves with a phase-delay of 90° you get a circular polarized wave, in which case the tips of the vectors of the electric and magnetic field draw a helix

[gigagagugu]

actually you are (kind of)

light can be linear polarized, in which case the orientation of the electic field stays in the same plane (and the magnetic field orthogonal to it)

in this case the 2d sine is actually as acurate as you can get (remember, the amplitude doesnt represent a spatial amplitude but the strenght of the field)

[Firehawk2047]

I love the paradox in 12:00

[mirrusca]

30:00

[SecondEricSanderson]

LOL

[Physics400]

There are physics classes available at my college. I might just take them after watching the lecture of this one college. Even if i don't understand the mathematics of it, lol.

[timray99]

i don't do emails......but i have enjoyed your lecture series very much.....i am in Southern California

[calvinhobbesliker2]

When two light or sound waves cancel each other, where does their energy go?

[thinker6236]

becomes heat.

[DoubleDutchBust]

Physics 10 - Lecture 18: Quantum II

oO I Love You AnyWays Just=don't know

You-

poi

[DoubleDutchBust]

Lecture 18: Quantum II

Forty three yEarsean 3:23

Eye have been with youcberkeley

Forty three yEarsean 3:23

Lecture 18: Quantum II

[DoubleDutchBust]

OrangeCounty So!

Lecture 18: Quantum II 11:11 22:22

33:33 44:44

12:01

x 13:13

[landin048]

Come on, people. If you're here to clown on the educational level of the lecture, why are you still here?

[CrockSkinTesticles]

@landin048 yeah really, you'd think they would tire after the first 17 lectures...

[shreader3]

I don't get it future presidents?

[kangkungking]

"for future presidents" = "for people who have no clue about the world, but ought to know where money should be applied" ;-)

[cpricejones]

for keeping hope alive in the hearts of students? heh

[sn1pe352]

Everything you've learned so far and this man has been teaching can be explained with the music of the spheres

[PARKEREAL]

or as follows

using quantum physics and a meth high its completly obvious that the flux capciter if you would elaborated a single atom to appear on the 22 flloor of the world trade center while at the same time in a alternate shape shifting deminsion the same atom was in vegas in a slot machine name big rhonda. there it is ive solved the conspiracy and taught quantum while adding a little back to the future . its really that simple. my thoughts are not mine but the thoughts of the megaverse

[marsCubed]

Parkereal, you say Megaverse, but have you considered Negaverse? If we dream worlds into being by observing them; imagining them; by moving energy around inside our minds and touching it with our consciousness.. then what is it which observes our mind and brings that into being also? Mind imagining mind? Reflections?

Blackboards are great, One just has to be careful not to catch fingernails while screeching out mad physics.

[JohnnySkillish]

You know what? Even if it's not perfect, it's free and it's educational for the laymen. Good enough for me. It's STILL educational.

[ManlioGiordano]

Berkeley should change the settings of these posted videos, so that comments have to be approved.

[opensource1212]

yea...freedom of expression is overrated.

[barbambi]

but actually, what he is saying is wrong..

the wave function of two particles is not the sum of the wavefuctions... i.e. twice the amplitude as he claims... it's in fact a "tensor product", or in real terms, a wave in 6-dimensional space, (2 x 3 dimensions). THAT's what gives rise to quantum effects.

So glad I wasn't educated at Berkeley.

[Sebolains]

hahahahahaha. Yeah, well it is pretty basic, but you have to take into account that it's a future president's class. I guess they don't really need physics. Nevertheless, that doesn't mean that he is justified to make a mistake.

[hei21387111]

glad you pointed it out :)

but for his defence i would like to say that

to err is human.

after all his covering such a wide area with his lectures.

[Julchen68]

How come all people who claim themselves to be oh so educated and intelligent are completely unable to grasp the underlying concept of these lectures?

Go sit in a corner and resume feeling smart! *rolleyes*

[opensource1212]

Sure, but this is physics for future presidents....his job in this class is to provide a basic understanding of very complex ideas, and that he does quite well.

As Muller repeatedly states...if it gets serious, hire a physicist.

[laputahayom]

so can some one tell me what the qunta would be if you double the amputide of the light wave please

does it follow a rule like

x=y+(y/0.5)

or something

[keggerous]

it has to do with the frequence not the amp

[MadMojoMonkey]

The 'amplitude increase' just means that there's more than 1 photon. The energy 'amplitude' always comes in integer multiples of the energy of 1 photon, hf. (h is Planck's Constant, f is the frequency)

This assumes that we're talking about photons of the same frequency.

[curvand]

This is the best intertainment i have seen for a long time and i enjoy every video... wow there's a lot i don't know about this world he he... my friends will probably agree with me in that statement :-)

[divinequestion90]

so are you trying to say your secondary school teacher has a PhD?

[gabecollett]

most interesting stuff is taught in High School anyways

the goal of University is to explore what compells you as a Human Being in Society, not how much stuff you can recite or how fast you can manipulate equations

[DustininSD]

And what school do YOU attend?

[drclintharper]

UC Berkeley still uses blackboards!  Geeeeeeeeeez

[laputahayom]

especially at that distance.

[AntonyMussUK]

What did you expect from "Physics for Future Presidents" "stressing conceptual understanding rather than math"? Go do the course work or find something more appropriate. (Search for "Richard A Muller" from Google.)

[grantflashdance]

Are you stupid or something?