Discussion
For air, the Prandtl-Meyer function evaluated at \( M = 2 \) is nearest to
Answer: B
The standard value is \( \nu(2) = 26.38 \) degrees. It says that a sonic stream must be turned through just over twenty-six degrees to reach Mach 2. The other options are the function evaluated at Mach 1.5 and Mach 3, and the Mach angle at Mach 2.
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