Discussion
In a stream at \( M_1 = 3 \), the smallest angle an oblique shock can make with the flow is nearest to
Answer: D
The limiting case is a vanishingly weak wave, whose angle is the Mach angle \( \mu = \arcsin(1/3) = 19.47 \) degrees. Any real oblique shock at this Mach number lies between that value and ninety degrees, the latter being the normal shock.
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