Describe an experiment to show that each source of sound is a vibrating body.

The following experiment shows that each source of sound is a vibrating body:

1. Take a ruler.
2. Press its one end on the table with the left hand as shown in the figure below.
3. Pull down the other end of the ruler with the right hand and then leave it.

We will notice that the ruler vibrates i.e., the ruler moves to and fro and a humming sound is heard. After sometime the ruler stops vibrating. No sound is then heard.

This shows that the humming sound is produced only because of the vibrations of the ruler. Hence, we can say that each source of sound is a vibrating body.