Question

In an experiment of photoelectric effect, the graph of maximum kinetic energy $E_k$ of the emitted photoelectrons versus the frequency v of the incident light is a straight line AB as shown in Figure below :

(i) Threshold frequency of the metal.
(ii) Work function of the metal.
(iii) Stopping potential for the photoelectrons emitted by the light of frequency $v=30x\times {10}^{14}Hz$.

Answer 1

(i) Threshold frequency $=10{\times }^{14}Hz$.

(ii) Work function $=4eV(-ve$ intercept on Y-asix$)$.

(iii) Stopping potential $=8eV$ from graph.