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The fig. shows the variation of photon c...

The fig. shows the variation of photon current with anode potential for a photo-sensitive surface for three different radiation. Let `I_(a), I_(b) and I_(c)` be the intensities and `f_(a), f_(b) and f_(c)` be the frequency for the curves a,b and c respectively.

A

`v_(a)=v_(b) and I_(a)!=I_(b)`

B

`v_(a)=v_(c) and I_(a)=I_(c)`

C

`v_(a)=v_(b) and I_(a)=I_(b)`

D

`v_(b)=v_(c) and I_(b)=I_(c)`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) : Form the graph, we note that the saturation current is same for curves b and c but different for curve
a. Therefore, intensities of b and c will be equal but different from that of a i.e. `I_(a)!=I_(b)"but"I_(b)=I_(c)`. As stopping potential is same for curves a and b, hence `v_(a)=v_(b)`. Thus answer (a) is correct.
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