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Question

In Davisson-Germer experiment, intensity was maximum for accelerating voltage equal to
  1. 44
  2. 54
  3. 64
  4. 74

A
54
B
44
C
64
D
74
Solution
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In Davisson-Germer experiment, maximum intensity of diffracted electron beam was found at different angles by varying the applied voltage to the electron gun. The highest intensity was observed at an angle ϕ=50o with a voltage of 54V, giving the electron a kinetic energy of 54eV.

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