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

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Saturation current is proportional to intensity while stopping potential increases with increase in frequency. Hence, v a = v b while I a < I b

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