Discussion
Assertion (A): An expansion fan reflects from a solid wall as a compression.
Reason (R): A solid wall requires the flow to remain tangent to it.
Select the correct answer from the options below.
Answer: A
The assertion is false and the reason is true. Tangency does have to be restored, but the incident expansion turned the flow away from the wall, so a further expansion is what turns it back. A solid wall reflects a wave in kind; it is a constant-pressure boundary that reverses its sense.
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