The Ghost wrote:


The linear motor does *not* radiate
the low frequency as sound waves, as a loudspeaker does. This completely
changes the dynamics of the situation in terms of the motion of the
radiators and the transfer of energy into the surrounding air.


That is incorrect. The surface of the piezo element radiates the low
frequency motion of the motor shaft, but that radiation is very low
because the frequency is low and because the surface area of the piezo
element is small. Furthermore, the amount of low-frequency sound that
is radiated is irrelevent to the issue of the production of dynamic
Doppler shift.

He was correct and you are not. It is entirely a matter of
the frequency dependant coupling.

I know, I know. You could prove otherwise but won't.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein