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 $v = 30 x \times 10^{14} H z$ .

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Solution

(i) Threshold frequency $= 10 \times^{14} H z$ .
(ii) Work function $= 4 e V (- v e$ intercept on Y-asix $)$ .
(iii) Stopping potential $= 8 e V$ from graph.

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