Discussion
A wing's critical Mach number is \( 0.76 \) and its drag-divergence Mach number \( 0.82 \). At \( M = 0.79 \) the wing is
Answer: B
A supersonic pocket has appeared, since the critical value has been passed, but the shock closing it is not yet strong enough to produce the sharp drag rise. This band between the two Mach numbers is precisely where a supercritical section is designed to operate.
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