Physics - Chapt. 66 Quantum Mechanics (5 of 9) Einstein - The Photoelectric Effect

In this video I will introduce Einstein and explain his photoelectric effect.

Next video in the series can be seen at:

[valeriereid]

Thank you so very much Professor for making this very interesting topic so easy to grasp.

[mrsakeru]

Very informative! Quite helpful. Thank You!

[xXguzmanXx]

Little note: the Planck constant is in J*s, not in Joules

[zakirhussain-jsku]

Particle moves as wave-particle system. In case of light the speed of particle & its associated wave is equal to light speed, therefore particle & its associated wave moves as single unit. Energy of all photons is equal. Photons with short wavelength deliver more energy per unit time. Also particle is spread out at the centre of photon. With shorter wavelength the particle is more compact & delivers more momentum per photon per unit time. Long wavelengths photons take more time to transfer their momentum.

[LeatherHat]

Good lecture but the histrory is incorrect. The first version of the photocell experiment was
carried out by Robert A. Millikan whose aim was to disprove Einstein's theory.

[mohamedsherif]

Dear Michel
I appreciate your huge information you give..
My question is the photoelectric effect was started by Lenard's.. isn't?.. thank you

[Learningenglishajk]

In addition, the maximum
current increases as the intensity of the incident light increases, as you might
expect, and more electrons are ejected by the higher-intensity light.sir but you said that intensity of light has no link with the current either itensity is low or high.

[mohamedsherif]

I mean the experiment was carried out by Lenard but Einstein explained the link between Plank and Lenard theoretically.. Thanks again

[jakubkusmierczak]

Mr. Professor You mean infrared (long wave length) and ultraviolet (short wave length) radiation?

[johntindell]

thank you so much sir!, Profoundly helpful

[swetatomar]

sir, pls make a video on laws of photoelectric emission. Thanks :)

[curtpiazza]

But no Nobel Prize for Einstein for E=mc2. !?!?😮

[ahmedshinwari]

Was that Quantum Mechanics class...it wasn't difficult at all. I feel I already know much of QM. :p
Btw, I came here searching for 'who invented solar cells'...