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The value of the Prandtl-Meyer function at Mach one is

  • A.One radian
  • B.Undefined
  • C.Zero
  • D.Ninety degrees

Answer: C

The function is defined to vanish at Mach one, which sets it up as a measure of turning accumulated from sonic conditions. It rises steeply at first and then flattens, so most of the available turning is used up over the first few Mach numbers.

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