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 surce from emitter is kept constant.
- Which of the above statements are correct ?
(a) I and II
(b) II and III
(c) III and IV
(d) I, II and III
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