Discussion
Sonic air is expanded until it reaches \( M = 1.5 \). Through what angle has it turned?
Answer: C
Starting from Mach one, where the function is zero, the turning needed is just \( \nu(1.5) = 11.90 \) degrees. The distractor 41.8 degrees is the Mach angle at that speed, a quantity often confused with the Prandtl-Meyer function because both are angles attached to the same Mach number.
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