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Byju's Answer

Standard XII

Physics

The Photon Model

The cathode o...

Question

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 > $W_{2}$ )

$I_{1} = I_{2}$

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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
$I_{1} = I_{2}$

The work function has no effect on current so long as $h v > W_{0}$ . The photoelectric current is proportional to the intensity of light. Since there is no change in the intensity of light, therefore $I_{1} = I_{2}$ .

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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 change are l1 and l2 all other conditions remaining unchanged, then (assuming hn > W2)

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The correct option is A
$I_{1} = I_{2}$

The work function has no effect on current so long as $h v > W_{0}$ . The photoelectric current is proportional to the intensity of light. Since there is no change in the intensity of light, therefore $I_{1} = I_{2}$ .