Question

An echo returned in 3 S. What is the distance of the reflecting surface from the source, given that the speed of sound is 342ms?

Answer 1

Echo returns in 3S. Therefore time taken by sound to travel from the source to the reflecting surface
t = \(\frac{3}{2}\) = 1.5 S
Speed v = 342ms^-1
∴ Distance of reflecting surface from the source = Speed × Time
= 342 × 1.5 = 513 m