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Question

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

A
four times
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B
one-fourth
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C
zero
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D
doubled
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Solution

The correct option is B zero
The photoelectric current is obtained beyond the threshold frequency.
If the frequency of the light is halved, then it will become f=1.52=0.75 times the threshold frequency.

Since this is less than the threshold frequency, there will be no photoelectric current.

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