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Q.

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photo electric current is emitted.  If the frequency of light is halved and intensity is doubled, the photoelectric current becomes

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a

4 times the original current

b

2 times the original current

c

Zero

d

half the original current

answer is D.

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Detailed Solution

It the frequency becomes half it is less than threshold frequency P.E.E doesn’t takes place  so photo current=0

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Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photo electric current is emitted.  If the frequency of light is halved and intensity is doubled, the photoelectric current becomes