Discussion
Assertion (A): An expansion fan opens out as the flow passes through it.
Reason (R): The Mach angle decreases as the flow accelerates.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Each successive characteristic sits in faster flow and therefore lies at a smaller angle, so the family diverges. The compression case is the mirror image: characteristics converge and eventually coalesce into a shock.
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