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Speed of Sound

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Question

Anecho returned in 4 s . What is the distance of the reflecting surface from the source , given that speed of sound in air is 344 m/s .

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Solution

Given,
Speed of sound=344 m/s
Total time taken by sound=4 s
Then,
Speed=Distance/Time or Distance=Speed x time=344 x 4=1376 m
So, distance of reflecting surface from the source=1376 /2=688 m

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