See the Invisible
- big tin or bowl
- rubber band
- thin plastic bag
- big spoon
- baking sheet
- bits of paper and some sugar
- 1) Cut open the plastic bag along the bottom and one
side. Stretch the plastic tightly over the top of the tin or bowl. Secure
the plastic with the rubber band.
- 2) Take a piece of paper and tear it into very small
pieces. Place them on top of the drum you just made. If you tap the drum
with the spoon, the paper will jump.
- 3) Sprinkle a pinch of sugar on top of the drum.
Hold the baking sheet close to the drum and hit it with the spoon. If you
watch carefully, you will see the sugar jump.
Explanation: When you hit the
drum or the baking sheet with the spoon, they vibrate. These vibrations are
what cause the paper and sugar to jump. These vibrations also cause waves in
the air, which cause us to hear the noise. The vibrations travel through the
air bringing us the sound. If you put a hand on a radio, you can feel it
vibrate. Similarly, if you turn the bass on your radio up, you can feel the
beat beneath your feet.
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