1. Make a
hole in the bottom of both plastic
2. Thread one end of the string
through the bottom of one cup and
tie a knot inside the cup.
3. Thread the string through the
other cup and tie a knot inside
4. Have a friend hold one
cup and you hold the other. Make
sure that the string is tight.
5. Whisper into your cup whilst
your friend listens through the
The sound of your
voice makes the string vibrate,
carrying the sound to your friend’s
Check out how
Sounds and Vibrations work on our
Science Facts page.