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  4. The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2 > W1). If the current before and after changes are I1 and I2, all other conditions remaining unchanged, then (assuming h upsilon > W2)

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Q. 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 changes are $I_1$ and $I_2$, all other conditions remaining unchanged, then (assuming $h \upsilon > W_2$)

AIPMTAIPMT 1992Dual Nature of Radiation and Matter

Solution:

The work function has no effect on photoelectric current so long as $h \upsilon > W_0$. The photoelectric current is proportional to the intensity of incident light. Since there is no change in the intensity of light, hence $I_1=I_2.$