Discussion
Assertion (A): A shock wave is an isentropic process.
Reason (R): No heat is transferred to or from the gas as it crosses the shock.
Select the correct answer from the options below.
Answer: C
The assertion is false and the reason is true. Adiabatic and isentropic are not the same thing: a shock transfers no heat, but the steep internal gradients dissipate energy and raise entropy. That is exactly why the isentropic relations may be used on either side of a shock but never through it.
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