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Photons of energy 3.2 eV are incident on...

Photons of energy 3.2 eV are incident on a photosensitive surface. It the stopping Potential for the emitted electrons is 1.5 V, the work function for the surface is:

A

1.5 eV

B

1.7 eV

C

3.2eV

D

4.7eV

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