Explain the effect of the frequency of incident radiation in the experiment of the photoelectric effect.

(N/A) The figure shows a graph of the variation of photoelectric current with collector plate potential for different frequencies of incident radiation at a constant intensity.
For different frequencies of incident radiation,the stopping potential value obtained is different,but the saturation current remains the same.
For frequencies $\nu_{3} > \nu_{2} > \nu_{1}$,the corresponding stopping potentials obtained are $V_{03} > V_{02} > V_{01}$.
From this,it can be concluded that when the frequency of incident radiation increases,its energy $[E = h\nu]$ also increases. Hence,the maximum kinetic energy of the emitted photoelectrons depends on the energy (frequency) of the incident radiation.
When the energy of the photoelectrons is higher,a greater retarding voltage (stopping potential) is required to stop them.