Discussion
Match each quantity in List I with its behaviour across a normal shock in List II.
List I
A. Stagnation temperature
B. Stagnation pressure
C. Entropy
D. Static pressure
List II
1. Falls
2. Unchanged
3. Rises
4. Rises sharply
Select the correct match.
Answer: D
A shock is adiabatic but irreversible. Stagnation temperature therefore comes through unchanged, stagnation pressure falls, and entropy rises, that rise being what the second law requires and what rules out expansion shocks. The static pressure jumps sharply, which is what makes a shock audible as a bang.
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