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At 10:47 AM 1/10/00 -0500, kyle forinash wrote:
there is a distinctive chirp in the echo; lower sounds...
return faster creating an echo that rises in pitch.
Does anyone know exactly how this works?
If you had reported a sound that *falls* in pitch there would be a
beautiful explanation. It would be a great demonstration of
diffraction-grating physics.
It pretty much sounded like a rise to me (but no one said I have
perfect pitch!). The first half of a wolf whistle.
If I had stood in one spot and heard only the low notes coming back
and then heard high notes at a different location I would have said
diffraction. But I didn't move. I don't see how diffraction changes
the speed of return. Dispersion does this but I don't see why the
steps cause dispersion.
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You don't need to travel to the Yucatan to observe acoustical
diffraction. Any building with exterior lattice-work on a sufficiently
coarse scale will do nicely. Actually most such buildings are nicer than
pyramids, because they give you more options as to the angle of incidence.
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If you really are reporting a sound that *rises* in pitch I have no idea
what is going on.
kyle forinash 812-941-2390
kforinas@ius.edu
Natural Science Division
Indiana University Southeast
New Albany, IN 47150
http://Physics.ius.edu/
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