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Question

For silver metal, the threshold frequency (ν0) is 1.12×1017 Hz. What is the maximum kinetic energy of the photoelectrons produced by shining UV light of wavelength 15 A on the metal?
  1. 3.00×1017 J
  2. 5.8×1017 J
  3. 3.9×1017 J
  4. 2×1015 J


Solution

The correct option is B 5.8×1017 J
We know:
ν=cλ=3×108 ms115×1010 m=2×1017 s1(or Hz)
Also,
K.E=hνhν0=h(νν0)
K.E=6.626×1034×(2×10171.12×1017)
K.E=5.8×1017 J

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