The cathode of a photoelectric cell is change | vedclass

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(A) The photoelectric current in a cell depends on the number of photoelectrons emitted per unit time.This number is directly proportional to the inte

Vedclass · Accepted Answer

$I_1 = I_2$

Vedclass · Answer

(A) The photoelectric current in a cell depends on the number of photoelectrons emitted per unit time.This number is directly proportional to the intensity of the incident light,provided the frequency of the incident light is greater than the threshold frequency $(h
u > W)$.The work function $(W)$ determines the threshold frequency $(W = h
u_0)$,but it does not affect the number of photoelectrons emitted for a given intensity of light.Since the intensity of the incident light remains unchanged and the condition $h
u > W_2$ is satisfied,the number of photoelectrons emitted per unit time remains the same.Therefore,the photoelectric current remains unchanged,i.e.,$I_1 = I_2$.

The cathode of a photoelectric cell is changed such that the work function changes from $W_1$ to $W_2$ $(W_2 > W_1)$. If the current before and after change are $I_1$ and $I_2$,all other conditions remaining unchanged,then (assuming $h\nu > W_2$):

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