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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Physics (PH)
A question on photoelectric effect. kindly help
In photoelectric effect...suppose that a photon is incident on metal surface. Its energy is not sufficient to eject electron. So this photon energy is absorbed by the electron. Now if another photon is incident on that same electron the energy of electron must increase...and probably it may leave the surface(if electron gains energy more than work function now). Is it possible? This is not going correct on grounds of the theory of photoelectric effect.
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Isha lohan 1 Best Answer
Good question Vijay. Energy is not stored in electron. See what happens is, photon collides, electron gets energy, it gets excited, it can't leave atom as energy os not sufficient enough. But, electron gets excited, but this excited state remains there for a very short period of time, and electron again comes back to its ground state, emitting back equal amount of energy photon, so you see that for the photons with lesser energy, or say larger wavelength just gets reflected and not absorbed.
these photons with lesser energy have nothing to do with the photoelectric effect. I hope you get my point. ☺️
Thanks a lot 😁