Discussion
Assertion (A): The downstream Mach number behind a weak oblique shock is always subsonic.
Reason (R): The velocity component normal to an oblique shock is always subsonic downstream.
Select the correct answer from the options below.
Answer: C
The assertion is false while the reason is true. The normal component does drop below sonic speed, but the tangential component survives intact, so the resultant is usually still supersonic. This is precisely what allows a supersonic vehicle to carry several oblique shocks in succession.
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