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An amorphous material such as a glass gives a diffraction pattern that is

  • A.completely blank with no signal at all
  • B.a broad hump rather than sharp peaks
  • C.a set of unusually sharp narrow peaks
  • D.identical to the pattern given by quartz

Answer: B

Without long-range order there are no planes to satisfy the diffraction condition at any particular angle. The broad hump is itself informative and is how the glassy content of a fired body is estimated. Amorphous content is measured against an added internal standard.

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