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)

Question

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) (A) I1=I2 (B) I1 < I2 (C) I1 > I2 (D) I1 < I2 < 2I1

Tardigrade Admin · Accepted Answer

The work function has no effect on photoelectric current so long as h upsilon > W0. The photoelectric current is proportional to the intensity of incident light. Since there is no change in the intensity of light, hence I1=I2.

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 $h υ > W_{2}$ )

$I_{1} = I_{2}$

$I_{1} < I_{2}$

$I_{1} > I_{2}$

$I_{1} < I_{2} < 2 I_{1}$

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

Q. 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 hυ>W2​)

I1​=I2​

I1​<I2​

I1​>I2​

I1​<I2​<2I1​