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Which statement about entropy in shock flow is TRUE?

  • A.Entropy rises across any shock of finite strength
  • B.Entropy is constant across any adiabatic shock
  • C.Entropy falls across a weak shock and rises across a strong one
  • D.Entropy change depends only on the gas, not on the shock strength

Answer: A

Every shock of finite strength raises entropy, and the rise grows as the cube of the strength. Only in the vanishing limit of a Mach wave is the rise negligible enough to treat the process as isentropic. Adiabatic does not imply isentropic, which is the trap in the second option.

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