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

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$I_1 = I_2$

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 and the quantum efficiency of the cathode material.The work function $W$ determines the threshold frequency,but it does not affect the number of photoelectrons emitted for a given intensity of incident light,provided the energy of the incident photons $h
u$ is greater than the work function $(h
u > W)$.Since the intensity of the incident light and all other experimental conditions remain unchanged,the number of photoelectrons emitted per second remains the same.Therefore,the photoelectric current remains constant,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 the change are $I_1$ and $I_2$ respectively,with all other conditions remaining unchanged,then (assuming $h\nu > W_2$):

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