Discussion
Assertion (A): An expansion shock cannot exist in a gas.
Reason (R): The entropy of the gas would have to decrease across such a discontinuity.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. The conservation equations formally admit an expansion discontinuity, but evaluating its entropy change gives a decrease, which the second law forbids. Supersonic expansions must therefore be spread through a fan of Mach waves instead of concentrated into a front.
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