A cathode of photoelectric cell is changed such that the work function changes from $W_{1}$ to $W_{2}$ ( $W_{1} < W_{2}$ ). If the current before and after changes are $I_{1}$ and $I_{2}$ all other conditions remaining unchanged, then (assuming $h v > W_{2}$ ):

I_{1} = I_{2}

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I_{1} < I_{2}

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I_{1} > I_{2}

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I_{1} > I_{2} < 2 I_{1}

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Solution

The correct option is A $I_{1} = I_{2}$
Photo current is independent of the value of work function.
It is dependent on the intensity of the incident rays.
So, current will be same after changing the value of work function.
So, $I_{1} = I_{2}$

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The cathode of a photoelectric cell is changed such that the work function changes from $W_{1} t o W_{2} (W_{2} > W_{1})$ . If the current before and after change are $l_{1} a n d l_{2}$ all other conditions remaining unchanged, then (assuming hn > $W_{2}$ )