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(A) The photoelectric current depends only on the intensity of the incident radiation and the number of photons striking the surface per unit time,pro

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$I_1 = I_2$

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(A) The photoelectric current depends only on the intensity of the incident radiation and the number of photons striking the surface per unit time,provided the frequency of the incident light is above the threshold frequency.The work function $W$ determines the threshold frequency $(W = h
u_0)$,but it does not affect the number of photoelectrons emitted per unit time if the intensity remains constant.Since $hf > W_2$ (and consequently $hf > W_1$),photoemission occurs in both cases.Therefore,the photocurrent remains the same,i.e.,$I_1 = I_2$.

The material of the cathode in a photocell is changed such that the work function of the surface changes from $W_1$ to $W_2$ $(W_2 > W_1)$. If the photocurrents emitted before and after changing the cathode surface are $I_1$ and $I_2$ respectively,and $hf > W_2$,then:

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