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Unit 6: Sound Page 22
longitudinal wave. Here’s what you hand vibrated in the same direction
do: (parallel to the direction) the wave
was moving in. Your vibrating hand
1. Put a piece of tape on one slinky created a wave that was moving in
wire in the middle or so of the the same direction as the hand was
slinky. moving in. Did you take a look at
the tape? The tape was moving
2. Let your friend hold on to one
back and forth in the same
end of the slinky or anchor the
direction the wave was going.
slinky to a chair or table.
Do you see the difference between
3. Now stretch the slinky out, but
a transverse wave and a
not too far.
longitudinal wave? In a transverse
waves the particles vibrate in a
4. Quickly push the slinky toward
different direction (perpendicular)
your friend, or the table, and then
to the wave. In a longitudinal wave
pull it back to its original position.
the particles vibrate in the same
Did you see the wave?
direction (parallel) to the wave.
5. Now do it again, back and forth
What’s the Difference
several times and watch where the
slinky is bunched up and where it’s between Amplitude and
spread out. Wavelength?
6. Notice the tape. What is it Here’s an easy way to get a feel for
doing? amplitude:
1. Put a piece of tape in about the
middle of the rope.
2. Tie your rope to something or
let your friend hold on to one end
of it.
3. Now pull the rope so that it is a
bit slack but not quite touching the
Here you made a longitudinal floor.
wave. A longitudinal wave is where
the particle moves parallel to the 4. Your friend should hold their
medium. In other words, your hands as still as possible.
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