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"I sent CoolStuff to a new teacher I'm
mentoring. I use CoolStuff all the time and love it. The kids love it and learn from it!"
~ Dixie D. from Texas
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Lab #26.9
Sound: Sound Off
Purpose
In this activity,
students will hear a dramatic
effect of the interference of
sound.
Discussion
Interference
is a behavior common to all
waves. With water waves we
see it in regions of calm
where overlapping crests and
troughs coincide. We see the
effects of interference in
the colors of soap bubbles
and other thin films where
reflection from nearby
surfaces puts crests
coinciding with troughs. In
this activity we’ll
dramatically experience the
effects of interference with
sound!
Required Equipment
Stereo radio,
tape, or CD player with two
moveable speakers, one of which
has a DPDT (double pole double
throw) switch or a means of
reversing polarity (such as
switching red and black wires).
Download
Student Worksheet
Teacher Notes
Return to Lab Menu
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The "Speakers" required for this lab
are available from Radio Shack
or can be salvaged from old
stereo speaker systems. Each lab
group would need access to one
of each see lab detail for
specific use. |
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