The cathode of a photoelectric cell is change | vedclass

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Question

(A) The photoelectric current $I$ is directly proportional to the number of photoelectrons emitted per unit time.The number of photoelectrons emitted

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$I_1 = I_2$

Vedclass · Answer

(A) The photoelectric current $I$ is directly proportional to the number of photoelectrons emitted per unit time.The number of photoelectrons emitted per unit time depends on the intensity of the incident light and the number of incident photons,provided the frequency of incident light $v$ is greater than the threshold frequency $(hv > W)$.Since the work function $W$ does not affect the number of photoelectrons emitted (it only affects the kinetic energy of the emitted electrons),the photoelectric current remains unchanged as long as the intensity of the incident light is constant.Therefore,$I_1 = I_2$.

The cathode of a photoelectric cell is changed from a work function $W_1$ to $W_2$ $(W_2 > W_1)$. If the photoelectric currents before and after the change are $I_1$ and $I_2$ respectively,and all other conditions remain constant,then which of the following is true? (Assume $hv > W_2$)

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