Discussion
Assertion (A): An isentropic analysis is inappropriate for flow through a strong shock wave.
Reason (R): A shock wave raises the entropy of the gas passing through it.
Select the correct answer from the options below.
Answer: A
Both are true and the second explains the first. Isentropic relations assume constant entropy, which a shock plainly violates, so the Rankine-Hugoniot relations must be used across it instead. Isentropic relations remain perfectly good on either side of the shock, just not through it.
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