Question

A boy shouts while standing in front of a hill. He hears an echo after $6s$. If the speed of sound in air is $340m/s$, what is the distance of the hill from the position of the body?

• A. $519m$
• B. $1020m$
• C. $2040m$
• D. None

Answer 1

Answer: (B)

$1020m$

Let distance of hill from the position of the body be $d$.

Echo is heard after $6s$

Speed of sound, $v=340m/s$

So, $d=v\times \frac{t}{2}$

or, $d=340\times \frac{6}{2}=1020m$