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Across a normal shock wave the static pressure, temperature and density all

  • A.Remain unchanged
  • B.Increase, while the velocity decreases
  • C.Decrease, while the velocity increases
  • D.Increase, and so does the velocity

Answer: B

A shock is a compression, so pressure, temperature and density all jump upward while the flow is sharply decelerated. The abruptness matters too: the whole change happens over a distance of the order of a few mean free paths, which is why a shock is drawn as a discontinuity in any practical calculation.

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