Stretch Sound (Super Science Experiments)

You will need:

1. 2 large vacuum cleaner pipes (should be of equal length)
2. A friend

Stretch sound to understand that sound too
travels in waves.

INSTRUCTIONS

1. Take 2 large vacuum cleaner pipes and hold one end of each pipe to both ears.
2. Hold it as tightly as possible so as to seal any noise coming from outside.
3. Ask a friend to hold the other end of each pipe in his hand.
4. Keeping both pipes at an equal length ask your friend to talk into the pipes.
5. Next, stretch one of the pipes so that one pipe my be longer than the other.
6. Once again, keeping one pipe shorter than the other, ask your friend to talk into both the pipes.
7. What happens?

RESULT

When both the pipes were of equal length, the sound travelling through them to your ears reached your ears at the same time. However, when one of the pipes was extended (let’s assume the right pipe) it became longer than the leftone. And when your friend spoke into both the pipes this time, the sound reached your left ear before it did your rightone. Sound travels in waves and reaches our ears. As a result, when one of the pipes is stretched, the sound waves take longer to reach as there is more distance to travel.