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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

zero

b

half the original current

c

4 times the original current

d

2 times the original current

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Original frequency ν=1.5ν0

If frequency becomes halved it is 0.75ν0

So it is less than threshold frequency there is no emission of photo electrons whatever the intensity is.

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