Discussion
Assertion (A): Compression waves from a concave surface coalesce into a shock while expansion waves do not.
Reason (R): Compression characteristics converge because the Mach angle grows as the flow decelerates.
Select the correct answer from the options below.
Answer: A
Both are true and the second explains the first. Each successive compression wave sits in slower flow and lies at a larger angle, so the family converges and the waves eventually cross and merge. Expansion characteristics do the opposite and spread apart indefinitely.
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