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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

electron 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 energy, with a maximum of `E_(0)`.

Text Solution

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The correct Answer is:
D
(d) : when a beam of electrons of energy `E_(0)` is incident on a metal surface kept in evacuated chamber, elecrtrons can be emitted with maximum energy `E_(0)` (due to elastic collision) and with any energy less than `E_(0)`, when part of incident ebergy of electron is used in liberating electrons from the surface of metal.
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