Make a string Telephone

Make a string Telephone

What you need

.  2 paper cups

.  A sharp Pencil to help poke holes

. string

Instruction

1. Cut a long piece of string Poke a small hole in the bottom of each cup
2. Thread the string through each cup and tie knots of each cup.
3. Move into position with you and a friend holding the cup at a distance that makes the string tight.
4. One person talks into the cup while the others puts the cup to their ear and listened.

What's happening?

Speaking into the cup creates sound waves which are converted into vibration at the bottom of the cup. The vibration travels Along the string and are converted back into sound waves at the other end so your friend can hear what you said. Sound travels through the air but it travels even better through solid such as your cup and string allowing to hear sounds the might be too far away when travelling through the air