"Bob Cain" wrote in message

Arny Krueger wrote:

"Bob Cain" wrote in message


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

That seems wrong, because the following is right:

In the frame of reference of the piston, no Doppler shift can be
observed.

If you are in the frame of reference of the piston, you're
going to get shanken _all_ to hell. :-)

Agreed.

Hey, you think getting zero Doppler is always painless? ;-)