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 :

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 :

Sonic boom is produced when a source of sound travels at a speed :

The sound created in a big hall persists because of the repeated reflections. The phenomenon is called

When a sound wave goes from one medium to another, the quantity that remains unchanged is :