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Experiment: Sound travels along string. Make your own telephone out of
cups and string to try it out!
1. Poke a hole in the middle of the bottom of the cups with a pin.
2. Cut string so it is 10-60 feet long.
3. Put the string through the hole on the bottom of each cup.
4. Tie a knot on each end of the string.
5. Pull tight and speak into one cup while another person listens in the other
cup.
Science Project
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Homemade Telephone
2 plastic cups
Materials
string
Directions
pin