How Do Sound Waves Travel?

We had fun investigating how sound waves travel.

You will need: a bowl, cling film, baking tray, rolling pin, rice

Method:

1. Stretch the cling film tightly over the bowl.

2. Sprinkle rice onto the cling film.

3. Hold the baking tray above the rice and hit the tray with the rolling pin. The sound makes the air vibrate and when the sound waves reach the cling film, the rice moves.