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Consider a beam of electrons (each elect...

Consider a beam of electrons (each electron with energy `E_(0))` incident on a metal surface kept in an evacuated chamber. Then

A

no electrons will be emitted as only photons can emit electrons.

B

electrons can be emitted but all with an energy `E_0`

C

electrons can be emitted with any energy , with a maximum of `E_0 - phi (phi` is the work function).

D

electrons can be emitted with any energy , with a maximum of `E_0`

Text Solution

Verified by Experts

The correct Answer is:
D
There is one situation when an electron in the beam collides elastically with an electron in metal, then whole energy of the primary electron will be transferred to secondary electron to be emitted from metal. Primary electron will remain there, but secondary electron will be emitted with energy `E_0` Also, electrons can be emitted with energy less than `E_0`
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