Experiment Disclaimer

Underwater telephone!

Instructions

1. Fit both funnels into the ends of the rubber tubing.

2. Stretch the balloon over the end of one funnel - make sure it's tight across the funnel

3. Place the funnel with the balloon into the water.

4. Place the other funnel over your ear - can you hear sounds from underwater?

5. Have a friend talk to you underwater - can you hear them clearly?

Back to light and sound experiments

You will need:

- 2 Plastic Funnels

- Rubber tubing to fit the funnel

- 1 Balloon

- A friend in a pool!

The stretched balloon picks up vibrations travelling through the water.
As the balloon starts to vibrate it amplifies the sound so you can hear it.
Whales can send and receive messages through water many kilometres away due to sound
being able to travel faster through water than normal air - Why? Water molecules are packed tightly.

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