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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

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The correct Answer is:
B
When a beam of electrons of energy `E_0` is incident on a metal surface kept in an evacuated chamber 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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