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Photons of energy 4 eV are incident on a...

Photons of energy 4 eV are incident on a metal. Maximum velocity of photo electrons emitted is `v`. When energy of incident radiations is decreased by 50%, velocity is halved, Work function of the metal is

A

1.33 eV

B

2.62 eV

C

4.02 eV

D

2.12 eV.

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