Discussion
Assertion (A): Stagnation temperature is unchanged across a normal shock wave.
Reason (R): A shock wave is an adiabatic process, even though it is strongly irreversible.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second explains the first. The energy equation fixes the stagnation temperature for any adiabatic process without work, whether or not it is reversible. Stagnation pressure is the quantity that suffers, because it responds to the entropy rise that irreversibility produces.
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