Discussion
For air at \( M = 1 \), the ratio of stagnation pressure to static pressure is nearest to
Answer: C
The isentropic relation is \( p_0 / p = (1 + 0.2 M^2)^{3.5} \). At \( M = 1 \) that is \( 1.2^{3.5} = 1.893 \). Its reciprocal, \( 0.528 \), is the critical pressure ratio, the value the back pressure must fall below before a converging nozzle will choke.
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