Question

When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photoelectrons to be ejected, it may consist of

• A. infra red waves
• B. X-rays
• C. visible light rays
• D. radio waves

Answer 1

The correct option is B X-rays

A photon with minimum energy is required to eject electrons from metal surface.
Increasing order of energy of EM spectra :
Radio waves < visible < infra red < X-rays
Since X-rays have higher energy than infra red radiation, visible and radio waves. So X-rays can emits photons electrons.