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Question

Work function of a metal is 2.51 eV. Its threshold frequency is

A
5.9×1014 Cycle/sec.
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B
6.5×1014 Cycle/sec.
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C
9.4×1014 Cycle/sec.
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D
6.8×1014 Cycle/sec.
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Solution

The correct option is D 6.8×1014 Cycle/sec.
W0=hv0v0=W0h=2.51×1.6×10196.6×1034
=6.8×1014 Cycle/sec.

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