Question

Draw a plot showing the variation of photoelectric current with collector plate potential foe two different frequencies, , of incident radiation having the same intensity. In which case will the stopping potential be higher ? Justify your answer.

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Solution
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The variation of photoelectric current with collector potential for two different frequencies, is shown in figure.
The photoelectric equation in terms of stopping potential is given by ,
So,  
Thus, Stopping potential will be higher for

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