Question
Consider a beam of electrons $($each electron with energy $E_0)$ incident on a metal surface kept in an evacuated chamber. Then
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Answer
If a beam of electrons of having energy $E_0$ is incident on a metal surface kept in an evacuated chamber.
The electrons can be emitted with maximum energy$ E_0 ($due to elastic collision$)$ and With any energy less than $E_0$, when part of incident energy of electron is used in liberating the electrons from the surface of metal.
The electrons can be emitted with maximum energy$ E_0 ($due to elastic collision$)$ and With any energy less than $E_0$, when part of incident energy of electron is used in liberating the electrons from the surface of metal.
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