Answer:
The graph between frequency of incident radiation and stopping potential for a given photo- sensitive surface is shown in Fig. From the value of the intercept on the potential axis, we can determine the work function \[{{W}_{0}}\] as follows: As \[e{{V}_{0}}=hv-{{W}_{0}}\] or \[{{V}_{0}}=\left( \frac{h}{e} \right)v-\frac{{{W}_{0}}}{e}\] \[\therefore \] Intercept on the potential axis \[=-\frac{{{W}_{0}}}{e}\] Work function, \[{{W}_{0}}=e\times \] Magnitude of intercept on the potential axis. If the distance of the light source from the cathode is reduced, then (i) the photoelectric current increases because the intensity of incident radiation increases, and (ii) the stopping potential \[{{V}_{0}}\] remains the same because it is independent of the intensity.
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