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The Mach number downstream of a normal shock wave is always

  • A.Less than one
  • B.Greater than one
  • C.Equal to one
  • D.Equal to the upstream Mach number

Answer: A

A normal shock always takes a supersonic stream to a subsonic one. This follows from the requirement that entropy increase: the alternative branch, taking subsonic flow to supersonic, would demand an entropy decrease and is forbidden by the second law. The stronger the shock, the lower the downstream Mach number.

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