In a message dated 6/18/2000 1:34:56 AM, Marc wrote: <<Once the sound is launched, if the signal speed changes over a path -- whether gradually or abruptly, due to changes in temperature, pressure, density, composition (as in a thermocline) -- the wavelength changes but the frequency doesn't.>> Marc; Yep I agree..... but it is the wavelength that is perceived and not the frequency, isn't it? Isn't temperature density shift analogous to the red/blue shift thingee? I am not real sure here but the light given off by a moving object shifts red or blue, or doesn't shift at all depending on where the observation is made..correct? The source has not changed in character, or pitch as it were, but the perceived result has and has done so depending upon position of perception ....correct? But shucks what do I know?, I still get get confused by ohms, amps, volts and watts! :-) Jim Bryant (FL)
This PTG archive page provided courtesy of Moy Piano Service, LLC