Question

Sketch the graphs showing variation of stopping potential with frequency of incident radiations for two photosensitive materials A and B having threshold frequencies v_A > v_B

(i) In which case is the stopping potential more and why ?

(ii) Does the slope of the graph depend on the nature of the material used ? Explain.

Answer 1

(i) For material B

From the graph for the same value of 'V', stopping potential is more for material

.'.  V₀ is higher for lower value of n₀

(ii) No

As slope is given by h/e which is constant.