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The echo tube
is a 100 foot long cardboard tube sloping up almost to the roof
of the Exploratorium. When the visitor claps his or her hands at
the end, an echo is heard about 1/5 second later. The echo has a
strange sound unlike the original clap (and much like the ricochet
heard in old cowboy movies) due to the many different path lengths
inside the tube. A rough estimate of the speed of sound can be made
by timing the echo of the clap. (Sound travels about 1000 feet per
second.)
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