Question

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 $E_{0} - \varphi$ ($\varphi$is the work function).
• D. Electrons can be emitted with any energy, with a maximum of $E_{0.}$

Answer 1

Answer: (D)

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

Answer 2

: When a beam of electrons of energy $E_{0}$is incident on a metal surface kept in an evacuated chamber, electrons cab 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.