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Sketch the graphs, showing the variation...

Sketch the graphs, showing the variation of stopping potential `V_s` with frequency v of the incident radiations for two photosensitive materials A and B having threshold frequencies `v_0gtv'_0` respectively.
(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?

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