Question

A boy hears an echo of his own voice from a distant hill after 1 second. The speed of sound is 340m/s. What is the distance of the hill from the boy.

Answer 1

Explanation:

Distance = speed x time

Here

speed = 340 m/s

time = 1 second

Distance = 340 x 1

= 340

Now it's the echo which the boy heard so ,

here distance will be

Distance = d/2

340/2

=170m