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Question

Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is
 
  1. 15 J 
  2. 16×1014J
  3. 4×1081J
  4. 4×1019J


Solution

The correct option is D 4×1019J
W0=hcλ0=6.625×1034×3×1085000×1010J=4×1019J

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