Describe an experiment to show that sound can travel in a solid.

The following experiment show that sound can travel in a solid:

1. Take two empty ice-cream cups. Make a small hole at the bottom of each cup and pass a long thread through them.
2. Tie a knot or match stick at each end of the thread so that the thread does not slip out through the holes. This makes a toy telephone.
3. Now use the telephone as shown in the below figure and talk to your friend.

You will be able to hear the sound of your friend.

This shows that sound can travel through solid as sound travels through the thread and reaches the ear.