Q.

When frequency of incident light is lower than threshold frequency then

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a

Photoelectric emission takes place but with zero velocity

b

Photoelectric current decreases

c

Photoelectric current increases

d

Photoelectric current is zero

answer is A.

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Detailed Solution

When frequency of incident light is lower that threshold frequency, photoelectrons will not be emitted resulting in zero photoelectric current.

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When frequency of incident light is lower than threshold frequency then