Fig. shows variation of photocurrent with anode potential for 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)` the frequencies for curves a, b to c, then:

Options

A. `f_(a)=f_(b),I_(a)neI_(b)`
B. `f_(a)=f_(c),I_(a)=I_(c)`
C. `f_(a)=f_(b),I_(a)=I_(b)`
D. `f_(b)=f_(c),I_(b)=I_(c)`

Answer

A

Explanation

Saturation current is same for curves .b. and .c. but different for .a.. So `I_(b)=I_(C)&I_(a) neI_(b)`. As stopping potential is same for a and b, so `f_(a)=f_(b)`