impedance and empericism

[JIMRPT@AOL.COM]

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)