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 ?

(i) Since work function ɸ = hvɸ0’ = hv0’Metal ‘A’ has highe

(i) Since work function ɸ = hv
ɸ₀’ = hv₀’
Metal ‘A’ has higher work function as v₀’ > v₀.
(ii) Slope of

straight V subscript 0 space greater than space straight v space space space space space therefore space space graph space equals space straight h over straight e

(iii) Intercept of graph A on the potential axis

negative fraction numerator straight ϕ subscript 0 apostrophe over denominator straight e end fraction space equals space minus fraction numerator hv subscript 0 apostrophe over denominator straight e end fraction.

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