Discussion
Assertion (A): A body moving supersonically gives no warning of its approach ahead of its Mach cone.
Reason (R): Pressure disturbances travel relative to the gas at the speed of sound.
Select the correct answer from the options below.
Answer: C
Both are true and the second explains the first. Since the body outruns its own pressure signals, those signals can never get ahead of it and are confined within a cone. The fluid outside that cone is the zone of silence, which is why a supersonic aircraft is heard only after it has passed.
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