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