1. Make a
very small hole in the bottom of both plastic
2. Thread one end of the string
through the bottom of one cup so that the end of the string is being fed inside the cup and
tie a knot inside the cup.
3. Thread the string through the
other cup and tie a knot inside
the cup as above.
4. Have a friend hold one
cup, you hold the other and slowly walk away from each other.. Make
sure that the string is taut but not too tight and not slack.
5. Whisper into your cup whilst
your friend holds thier cup over their ear and listens to try to hear what you are saying.
The sound of your
voice makes the string vibrate,
carrying the sound down the string to your friend’s
Check out how
Sounds and Vibrations work on our
Science Facts page.