Discussion
The Mach angle of a weak disturbance in supersonic flow is given by
Answer: D
Disturbances travel outward at the speed of sound while being swept downstream at the flow speed, so the envelope they form makes an angle whose sine is the ratio of the two, that is the reciprocal of the Mach number. The angle narrows as the Mach number rises, and it is undefined below Mach one.
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