Sound - Paper Cup Telephone

The objective of this lesson is to demonstrate how sound can travel through solids. 

Materials: paper cups, string cut into 6 meter lengths, sharp pencil, paper clips. 

Procedure:

1. Make a small hole in the bottom of the cups with a pencil

2. tie one end of the string to the paperclip and feed the other end of the string through the inside of the cup, that way the paper clip is on the inside of the cup

3. Thread the other end of the string through the bottom of the other cup and tie a paper clip onto the end of it so that both cups are tied together in opposite ends of the string.

4. Allow the students the chance to discover how to operate their telephones.

Below are some other suggestions you can have the students do to experiment and hypothesize with different types of sounds and vibrations.

Paper Cup Telephone