What is the minimum distance needed for an echo? – InterviewSolution

InterviewSolution

1.	What is the minimum distance needed for an echo?
Answer» SOLUTION :(i) heminimum DISTANCE required to hear an ECHO is `1//20^(th)` part of the magnitude of the velocity of SOUND in air. (ii) If you consider the velocity of sound as `344ms^(-1)`, the minimum distance required to hear an echo is

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