>From: "Alex A." <[EMAIL PROTECTED]>
>Date: Fri, 06 Dec 2002 11:07:23 -0800

>I thought "doppler" has something to do with differences between
>originally sent wave and its reflection from the object (so you can
>determine the object's speed). Correct me if I am wrong.

Not really.

It was first described as such by Christian Doppler (hence the
name), who noted that from the perspective of a "stationary" observer,
the apparent pitch of the whistle of a train rose as the train
approached, but fell as the train departed.

Thus, it is an apparent frequency-shift that depends on the relative
velocities of the source of a wave and the observer.

Cheers,
david       (links to my resume at http://www.catwhisker.org/~david)
-- 
David H. Wolfskill                              [EMAIL PROTECTED]
I have no confidence in results obtained through the use of Microsoft products.
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