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Question

The threshold frequency of potassium is 3×1014Hz. Its work function is-
  1. 1.0×1019 J
  2. 2×1019 J
  3. 4×1019 J
  4. 0.5×1019 J

A
2×1019 J
B
4×1019 J
C
0.5×1019 J
D
1.0×1019 J
Solution
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Work function will be ϕ=hν0=6.62×1034Js×3×1014Hz=19.86×1020J which is nearly 2×1019J
Option B is correct.

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