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From the given figure,  describing photoelectric effect, which of the following can be inferred correctly? 

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a
Na and Al both have the same threshold frequency
b
Maximum KE for both the metals depend linearly on the frequency
c
The change in stopping potentials are different for Na and Al, for the same change in frequency
d
Al is better photosensitive material than Na

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detailed solution

Correct option is B

hv=hvo+KEmaxhv=hvo+eVsVs=hve-hvoevo→intercept  of x axisIf  Δv  is  same  ΔVs  also  same

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