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Unit 6: Sound Page 23

5. Vibrate your hand but only move

it up and down about a foot or so.
Have your partner pay attention to 3. Your friend should hold their
how that feels when the wave hits hands as still as possible.
him or her.
4. Now begin vibrating your hand

6. Now, vibrate your hand but now fairly slowly. In this case, it works
move it up and down 2 or 3 feet. better if you move your hand in a
How does that feel to your partner? circle.

7. Have your partner do the 5. Try to make a wavelength with
vibrating now and see what you the rope. In other words it will look
feel. like you’re playing jump rope.

You created two different 6. Now try a one and a half
amplitude waves. The first wave wavelengths.
had a smaller amplitude than the
7. Can you get two or more
second wave. What you and your
wavelengths? You’ve really got to
partner should have felt was more
get your hand moving to get it.
energy the second time. The wave
should have hit your hand with
In this image, the left wave is ONE
more energy when the wave had
wavelength, the middle is 1.5
more amplitude.
wavelegnths, and the right is TWO
wavelengths. See the difference?
Here’s a great way to visualize
wavelength:
Did you notice how the frequency

of your hand determined the
1. Tie your rope to something or
wavelength of the rope? The faster
let your friend hold on to it.
your hand, moved the more
2. Now pull the rope so that it is a wavelengths you could get.
bit slack but not quite touching the

floor.

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