Discussion
Match each incident wave and boundary in List I with the reflected wave in List II.
List I
A. Expansion striking a solid wall
B. Expansion striking a constant-pressure boundary
C. Shock striking a solid wall
D. Shock striking a constant-pressure boundary
List II
1. Compression
2. Expansion
3. Shock
4. Expansion fan
Select the correct match.
Answer: C
The rule is worth memorising in one line: a solid wall reflects a wave in kind, a constant-pressure boundary reflects it with the sense reversed. The second half of that rule is what drives the alternating pattern of shock diamonds in an imperfectly expanded plume.
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