Why photocurrent increases with increase in intensity of light ?

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Reason:-
 Intensity of light increase means no. of photon increase, if no. of photon increase then they are  eject more electron from the metal surface that implies photocurrent increases because current increases with increase in no. of electron motion per unit time.(I=Q/t) 
It is the answer to the question why photocurrent increases with increase in intensity of light.

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