A person burned a firecracker in front of a cliff and heard its echo 5 s after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to

An echo is heard after 5 seconds of the production of sound which moves with a speed of 340 m/s. What is the distance of the mountain from the source of sound which produced the echo?

A worker was working on the rail track. A boy at a distance holds his ear near the rail track. This boy was able to hear sound of the blow of workman twice. It is because of :

When the same tone is played on a sitar and a fute, the sound produced can be distinguished from each other because of the diference in :

How much should minimum distance be between the source of sound and reflecting surface, so that an echo can be heard clearly?

The speed of sound is faster in