Bob Cain wrote:



Arny Krueger wrote:


Sorry Bob, but I'm not buying.


How about this, then:

1) It is the bulk velocity, the flow of air, at the rest position that
propegates out as the velocity wave.

2) The bulk velocity at the rest position is the same as the surface
velocity of the piston.

And, finally:

3) In the frame of reference of the rest position of the
piston, no Doppler shift can be observed.


Bob
--

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

A. Einstein