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A Mach wave differs from a shock wave in that a Mach wave is

  • A.Infinitesimally weak, so the flow through it is isentropic
  • B.Stronger, so it produces a larger entropy rise
  • C.Always normal to the flow direction
  • D.Confined to subsonic flow

Answer: A

A Mach wave is the limiting case of a vanishingly weak disturbance, so the property changes across it are infinitesimal and the entropy rise is of second order and negligible. A shock of finite strength turns the flow abruptly and raises entropy measurably, destroying stagnation pressure in the process.

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