Discussion
Total pressure ratio across a normal shock at Mach 2.0 is about 0.72. Across two oblique shocks followed by a weak normal shock the recovery is about 0.90. The improvement is
Answer: D
The gain is \( (0.90-0.72)/0.72 = 0.25 \). Splitting the deceleration across several weaker shocks recovers most of what a single strong shock wastes, which is exactly why multi-shock intakes appear above about Mach 1.6.
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