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Question

Question: The figure shows the variation of photo current with anode potential for a photo-sensitive surface f...

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 –

A

fa = f­­­b and Ia¹Ib

B

fa = fc and Ia = Ic

C

fa = fb and Ia = Ib

D

fb = fc and Ib = Ic

Answer

fa = f­­­b and Ia¹Ib

Explanation

Solution

Stopping potential of a & b same so frequency

fa = fb

* Saturated photoelectric current of b & c same so intensity Ib = Ic > Ia