IMPROVISED TELEPHONE
I: PROCEDURES
1. Make a hole at the bottom of the cups. Make it just enough for the string.
2. Insert the string to the holes at the bottom of the cup.
3. Tie both end of the cup.
4. Communicate.
II. CONCLUSION
As you speak, the telephone vibrates. This means that the medium used for the sound to travel to the other cup is vibration.
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