SEE SOUND - experiment 4

You need :
1. a sheet of plactic (cut from a carrier bag)
2. an elastic band
3. a plastic bowl
4. a saucepan, drum - drumstick, cymbal
5. a wooden mixing spoon
6. coarse grain salt or rice / beads.

What to do:
1. Put the plastic sheet over the top of the bowl. Keep the place with the elastic band so that the plastic is tightly stretched.
2. Place the salt or the rice on the plastic.
3. Hold the saucepan near the plastic bowl ( but not close enough to touch ) and hit it a few times with the wooden spoon.

What happens?
The grains of salt or rice jump about.

Because....
...when the saucepan is hit, it makes a noise which vibrates. This makes the air around it vibrates as well, producing sound-waves. When these waves hit the bowl, the bowl vibrates and makes the salt or the rice jump about.