Question

Any ray of light incident on a metallic surface:

• A. makes the electrons of the metal atoms to be ejected out.
• B. cannot eject the valence electrons unless its energy content is more than the binding energy of the electrons.
• C. cannot eject the valence electrons unless its energy content is more than the work function of the material.
• D. both (b) and (c)

Answer 1

The correct option is D both (b) and (c)

When a ray of light is incident on a metal surface, valence electrons are emitted if the energy of incident light is more than binding energy of electron or the workfunction of the material.

Otherwise, no valence electron will be emitted which is the basic requirement for photoelectron to be emitted.