Question

An echo was heard after 3 s.
What is the distance of the
reflecting surface from the
source, given that the speed of
sound is 342 m s-l?​

Answer 1

Answer:

Speed of sound, v = 342 m sˆ’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=1026/2m = 513 m.