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Monochromatic light incident on a metal ...

Monochromatic light incident on a metal surface emits electros with kinetic energies form 0 to 2.6 eV. The tightly bound electron needs 4.2 eV. The least energy of the incident photon is

A

1.6 eV

B

6.8 eV

C

between 1.6 eV to 6.8 eV

D

more than 6.8 eV

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