Question

An echo is returned in 6 seconds. What is the distance of reflecting surface? from source? [Given that speed of sound is 342 m/s.]

Answer 1

Given..
Time in which echo returned t=6s.
speed of sound v=342m/s.
distance=speed*time=342*6=2052m.
As this distance is twice the distance of reflecting surface from source.
so,
the distance of reflect surface=2052/2=1026m