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Question

A metal whose work function is 3.3 eV is illuminated by light of wavelength 3×107 m. What is the threshold frequency for photoelectric emission? Given Planck's constant =6.6×1034 Js.

A
0.4×1015 Hz
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B
0.8×1015 Hz
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C
1.6×1015 Hz
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D
3.2×1015 Hz
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Solution

The correct option is B 0.8×1015 Hz
Work function, W0=hν0=3.3eV=3.3×1.6×1019 J
Therefore, the threshold frequency, ν0=W0h=3.3×1.6×10196.6×1034=0.8×1015Hz
Hence, the correct choice is (b).

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