Electrons ejection

Clara Cho 2K
Posts: 84
Joined: Wed Sep 18, 2019 12:18 am

Electrons ejection

how would you calculate the wavelength of the incoming light, if the frequency of the light is fixed and you're given a value for the KE?

SGonzales_3L
Posts: 55
Joined: Thu Jul 11, 2019 12:17 am

Re: Electrons ejection

You would use the equation for the conservation of energy in the photoelectric effect. You know that:
Ephoton= Threshold Energy + Kinetic Energy
The threshold energy was supposed to be calculated in the Q2A. The Kinetic Energy was given.
Ephoton= hv where h=Planck's constant and v= frequency. Using this knowledge and $c=\lambda v$, you can solve for the wavelength of the incoming light.

Mai V 4L
Posts: 55
Joined: Fri Sep 28, 2018 12:23 am

Re: Electrons ejection

Does anyone have a video theey think is a good reference for this topic?