The figure shows the variation of photo-current with anode potential for a photo-sensitive surface for three different radiations. Let Ia, Ib and Ic be the intensities and fa, fb and fc be the frequencies for the curves a. b and c respectively
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a
fa=fb and la≠lb
b
fa=fb and la=lc
c
fa=fb and la=lb
d
fa=fb and la≠lc
answer is A.
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Detailed Solution
The stopping potential for curves a and b is same.∴fa=fbAlso saturation current is proportional to intensity∴Ia=Ib