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Question

No photoelectrons are emitted from a metal if the wavelength of light exceeds 6000 A. The work function of the metal is approximately equal to

A
3×1016 J
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B
3×1019 J
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C
3×1020 J
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D
3×1022 J
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Solution

The correct option is B 3×1019 J
Cut-off wavelength, λ0=6000 A=6×107 m
Now, work function, W0=hcλ0=6.6×1034×3×1086×107=3.3×1019 J3×1019 J
Hence, the correct choice is (b).

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