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Assertion- If energy of incident photon ...

Assertion- If energy of incident photon is less than work function of a metal, electrons are not ejected from it.
Reason- If kinetic energy of ejected electrons is zero then work function of the metal is equal to energy of incident photon.

A

both assertion and reason are true and reason is correct explanation

B

both assertion and reason are true but reason is not correct explanation

C

assertion is true and reason is false

D

assertion is false and reason is true

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