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A planetary mill achieves very high energy input by

  • A.passing the powder through a long series of crushing rollers
  • B.dissolving the powder away in a suitable organic solvent
  • C.rotating the jars about their own axes and about a common axis
  • D.heating the powder up very strongly indeed while it is being ground

Answer: C

Correct answer: rotating the jars about their own axes and about a common axis

The jars spin while the carrier disc rotates in the opposite sense, so the media experience centrifugal accelerations many times gravity and strike with correspondingly greater force. The energy input is high enough to cause mechanical alloying and reaction as well as size reduction.

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