Which of the following statements is incorrect regarding the Davisson-Germer experiment?

  • A
    The interatomic spacing in the nickel crystal is of the order of the de Broglie wavelength.
  • B
    The electron gun provides electrons of constant energy.
  • C
    The nickel crystal acts as a three-dimensional diffraction grating.
  • D
    The Davisson-Germer experiment is an interference experiment.

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