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For the past few days there has been a stack of big steel pipes in the roadeffect.
outside where they are installing a new gas main. These are steel pipes (I
guess) about 25cm in diameter and 12 metres long as measured by pacing them.
Great, I thought, we can observe reflection from the open end. This is done
by going "boh" into the pipe and listening to the sound bouncing back and
forth. Works well. Today I chanced to click my tongue instead of going "boh"
and observed an interesting effect. What I heard back was a sort of high
frequency "pew" sound, just as if the click had been dispersed, with the
higher frequencies arriving first. Snapping my fingers produced the same
Jim Riley, Department of Physics
Now I thought that sound in air is non-dispersive. Any ideas?
Mark.
Mark Sylvester
UWCAd, Duino, Trieste, Italy.