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Practice: Electron Diffraction and Microscopy

A beam of electrons passes through a crystal. A diffraction pattern of concentric rings is formed on a screen behind the crystal that records the positions of electrons that arrive at it, as shown in the diagram. The intensity of the rings is plotted against the radial distance from the center of the pattern. The resulting intensity distribution is shown three times, each time compared to another intensity distribution that is shown below it.

Which of the intensity distributions would result from decreasing the velocity of the electrons in the beam?

  • ANone of these distributions
  • BIII
  • CII
  • DI

Which of the intensity distributions would result from decreasing the charge density of the electron beam while not changing the velocity of the electrons in the beam?

  • AI
  • BNone of these distributions
  • CIII
  • DII

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