The figure shows the variation of photo current with anode potential for a photosensitive 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

Options

A. `f_(a) = f_(b)` and `l_(a) != l_(b)`
B. `f_(a) = f_(c )` and `l_(a) = l_(c )`
C. `f_(a) = f_(c)` and `l_(a) !=l_(c)`
D. `f_(a) = f_(b)` and `l_(a) = l_(b)`

Answer

A

Explanation

The stopping potential for curves `a` and `b` is same.
`:. F_(a) = f_(b)`
Also saturation current is proportional to intensity
`:. I_(a ) lt I_(b)`