For a photon of energy hv to eject an electron from a material with work function ϕ, the photon's energy must be
Greater that ϕ
Less than ϕ
Less than maximum kinetic energy
Equal to maximum kinetic energy
A
Greater that ϕ
B
Less than maximum kinetic energy
C
Equal to maximum kinetic energy
D
Less than ϕ
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Solution
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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 ϕ to eject an electron.
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