Discussion
At \( M = 2 \), a leading edge remains subsonic provided its sweep exceeds
Answer: C
The Mach angle is \( \arcsin(1/2) = 30 \) degrees, so the Mach cone lies 30 degrees from the flight direction. Measured from the lateral axis in the usual way, the leading edge must be swept more than \( 90 - 30 = 60 \) degrees to hide behind that cone and stay subsonic.
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