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Which statement about wave reflection is INCORRECT?

  • A.A shock reflects from a solid wall as an expansion fan
  • B.An expansion reflects from a solid wall as an expansion
  • C.An expansion reflects from a free boundary as a compression
  • D.A shock reflects from a free boundary as an expansion fan

Answer: A

A shock reflecting from a solid wall gives another shock: flow tangency has to be restored by a turn in the same sense, which means a further compression. The rule is that a wall reflects in kind and a constant-pressure boundary reverses the sense.

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