To observe the effect of intensity of light on photocurrent, I. col...

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To observe the effect of intensity of light on photocurrent,
I. collector is maintained at positive potential with respect to emitter.
II. frequency of incident light is kept fixed.
III. accelerating potential is fixed.
-IV. distance of source from emitter is kept constant.
- (a) I and II are correct
(b) II and III are correct
- (c) III and IV are correct
(d) I II and III are correct
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