Question

An echo is returned in 3 s. If the speed of sound is 342 m s1, then the distance between the source of sound and the reflecting body is

Answer 1

Answer: 513 m

Explanation: total time taken to return- 3 s

Time taken to go - 3/2 = 1.5 s

Speed - 342 m/ s

Distance - speed × time

Distance - 342×1.5

= 513 meter

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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