Question

For a photon of energy hv to eject an electron from a material with work function , the photon's energy must be 

A

Greater that

B

Less than

C

Less than maximum kinetic energy

D

Equal to maximum kinetic energy

Hard

Solution

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Correct option is A)

Work function is the minimum energy required to eject an electron from the surface. 
So the photon's energy should be greater than work function  to eject an electron.

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