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 ?

Write Einstein's photoelectric equation. How did Millikan prove the validity of this equation ?

In photoelectric effect experiment, show the variation of (a) photocurrent with collector plate potential for a given surface for different intensities of incident radiation. Do the curves meet at any point ? If so, why ? (b) photocurrent with intensity of radiation incident on a surface keeping the frequency and plate potential fixed.