Question

An echo is heard 0•4s after a boy lights a fire cracker 66meters away from a high building calculate the speed of sound

Answer 1

Answer:

See below.

Explanation:

The distance covered by the sound wave which was produced due to the cracker,

$2\left( 66\right) =132m$

This distance was travelled in 0.4s. Hence, the velocity will be,

$V=\dfrac {132}{0.4}=330 \ ms^{-1}$