In a message dated 6/17/2000 10:42:40 PM, Ric wrote: <<Hmm interesting--I suspect that when sound waves hit a temperature differencial that they refract just as light does--and I seem to rememeber that does affect frequency. I could have just imagined that--anyone know for sure?>> Ric; Absolutely on both counts. In water this phenomenon is called a "thermocline" and is used constantly by submarines to hide their location. The sound from a sub on one side of a thermocline will be either reflected back to the same side it originates from or it is "shifted" as to make the apparent location appear different than it really is. Frequencies going from colder to warmer water tend to shift upward in pitch and from warmer to colder lower in pitch. This is true in the world of sonar at any rate. There is a name for this stuff but I can't remember that right now.....probably three o'clock this morning though! Jim Bryant (FL)
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