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.
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.