Question

The number of photo-electrons emitted per second from a metal surface increases when

• A. The energy of incident photons increases
• B. The frequency of incident light increases
• C. The wavelength of the incident light increases
• D. The intensity of the incident light increases

Answer 1

The correct option is D

The intensity of the incident light increases

Intensity $\propto$ (No. of photons) $\propto$ (No. of photoelectrons)