Question

A echo is returned in 3 second . what is distance of the reflecting surface from the source , given that the speed of sound is 342m/s.

Answer 1

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Speed of sound (v) = 342m/sec

Echo returns in (t) = 3 sec

Distance travelled by sound = v×t

=342×3 = 1026 m

In the given time interval sound has to travel a distance that is twice the distance of the reflecting surface & the source. Hence the distance of the reflecting surface from the source

=1026/2

=513 m .

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Answer 2

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Speed of sound, v = 342 m s−1

Echo returns in time, t = 3 s

Distance travelled by sound = v × t = 342 × 3 = 1026 m

In the given time interval, sound has to travel a distance that is twice the distance of the reflecting surface and the source.

Hence, the distance of the reflecting surface from the source = (1026/2)m= 513m

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