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Sound is made when something vibrates (moves back and forth). When you tap a glass with water in it, both the glass and water vibrate. But it doesn't stop there. The vibrations also make the air inside and around the glass vibrate. You hear the vibrations of the air as sound. When you add more water to the glass and tap it again, everything vibrates differently and you hear a new sound. Does the sound get higher or lower as you add more water to the glass?
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Sent in by Christian of Portland, OR
Tap some tunes with a spoon and 8 glasses of water!
What You Need:
- 8 drinking glasses of the same size and shape
- container of water
- metal spoon
What You Do:
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Fill one glass with water and put an empty glass next to it. What would you hear if you tapped each glass with a spoon? Do you think the empty glass would sound higher than, lower than, or about the same as the full glass? Make a prediction.
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Test your prediction. Tap each glass with the spoon.
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Now use all 8 glasses. Place the glasses on a table so that they're lined up, but not touching.
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Fill each glass with a different amount of water.
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Then with a spoon, tap on each glass in the same place. What do you hear?
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What happens when you tap on different parts of each glass? How does the amount of the water in the glass affect the sound?
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Change the amount of water in each glass until you can play a simple song, like "Mary Had a Little Lamb."
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When you're done, come back to this part of the training and continue on to the Was That Science? section.
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