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Q.

ASSERTION: In photoelectric effect, the number photoelectrons emitted is always equal to number of photons incident.
REASON: The photons falling on the surface will eject photoelectrons, is not necessary

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a

ASSERTION  is true ,REASON is false

b

ASSERTION  is false ,REASON is true

c

ASSERTION  is true ,REASON is not a correct explanation

d

ASSERTION  is true ,REASON is a correct explanation 

answer is D.

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Detailed Solution

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The number of photoelectrons emitted is always less than or equal to number of photons incident.

If the energy of the photon incident is less than the work function of the metal there will not be any emission of photoelectrons.

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