Discussion
For air, the critical pressure ratio \( p^*/p_0 \) is nearest to
Answer: C
Raising the critical temperature ratio to the power \( \gamma/(\gamma-1) = 3.5 \) gives \( 0.833^{3.5} = 0.528 \). A converging nozzle chokes as soon as the back pressure falls below this fraction of the stagnation pressure, after which the mass flow is fixed.
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