Question

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.

Which one of the following is the correct graph between the maximum kinetic energy (Kₘ) of the emitted photoelectrons and the frequency of incident radiation (v) for a given photosensitive surface ?

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 –