Question
Sketch the graphs showing the variation of stopping potential with frequency of incident radiations for two photosensitive materials A and B having threshold frequencies v0 > v0respectively.
(i) Which of the two metals, A or B has higher work function?
(ii) What information do you get from the slope of the graphs?
(iii) What does the value of the intercept of graph ‘A’ on the potential axis represent ?
Solution
The above graph gives us the variation of stopping potential with frequency of incident radiation.
(i) Since work function ɸ = hv
i.e., ɸ0’ = hv0’
Metal ‘A’ has higher work function as v0’ > v0.
(ii)
(iii) Intercept of graph A on the potential axis is
