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

electrons can be emitted with any energy, with a maximum $E_{0} - ϕ$ ( $ϕ$ is the work function).

electrons can be emitted with any energy, with a maximum of $E_{0}$ .

electrons can be emitted but all with an energy $E_{0}$ .

answer is D.

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Detailed Solution

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 the incident energy of an electron is used in liberating the electrons from the surface of the metal.

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