Question

A photon of energy hv is absorbed by a free electron of a metal having work funcction w < h.Then :
(A) The electron is sure to come out
(B) The electron is sure to come out with a kinetic energy (h-w)
(C) Either the electron does not come out or it comes with a kinetic energy (h-w)
(D) It may come out with a kinetic energy less than (h-w)

Please answer with explanation

Answer 1

Answer:

option (c)

Explanation:

For the electron to come out, the incident photon energy must be greater than the work function of the metal. i.e. hv > w.

if hv < w, electron doesn't come out.

if hv > e, electron comes out with kinetic energy (hv-w).

Note : if the metal atom is inside the bulk , then the electron energy will be less than hv-w because the electron looses a bit energy due to collisions.

Answer 2

Answer:

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