Question

The work function for a photosensitive surface is 3·315 eV. The cut-off wavelength for photoemission of electrons from this surface is :

Assertion (A) : Photoelectric current increases with an increase in intensity of incident radiation, for a given frequency of incident radiation and the accelerating potential. Reason (R) : Increase in the intensity of incident radiation results in an increase in the number of photoelectrons emitted per second and hence an increase in the photocurrent.

Assertion (A) : Photoelectric effect demonstrates the particle nature of light. Reason (R) : Photoelectric current is proportional to frequency of incident radiation.

The quantum nature of light explains the observations on photoelectric effect as –