The figure shows the variation of photo-current with anode potential for a photo-sensitive surface for three different radiations. Let $I_{a}, I_{b} and I_{c}$ be the intensities and $f_{a}, f_{b} and f_{c}$ be the frequencies for the curves a. b and c respectively

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$f_{a} = f_{b} and l_{a} = l_{c}$

$f_{a} = f_{b} and l_{a} = l_{b}$

$f_{a} = f_{b} and l_{a} \neq l_{b}$

$f_{a} = f_{b} and l_{a} \neq l_{c}$

answer is A.

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Detailed Solution

The stopping potential for curves a and b is same.

$∴ f_{a} = f_{b}$

Also saturation current is proportional to intensity

$∴ I_{a} = I_{b}$

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