Message-Id: <199905131449.JAA01500@subcellar.mwci.net>
From: "eric nielsen" <entfolks@mwci.net>
To: "Pinhole Listserv" <pinhole@exploratorium.edu>
Subject: Re:very picky doppler echoes; falling coin sidenote
Date: Thu, 13 May 1999 09:46:05 -0500
re:
> I agree with Eric. if his drawing shows the set up correctly.
> The train itself is moving away from you and is doppler shifted down in
> frequency.
> There is an image train coming toward you, the train imaged by sound
> reflection off the canyon wall. The image train is doppler shifted up.
>
> (If the train is moving beside you neither toward nor away it will not be
> doppler shifted, but the image train will still be doppler shifted up.)
>
> The doppler shift from a canyon wall behind the train will then be?....
> .
> .
> .
> .
> shifted down because the image train is moving away from you.
>
> Paul D
--- that last part re: canyon wall behind the train.... in terms of real
train movement, the real train is moving away from the canyon wall...
re: coins & free fall: where does basic inertia figure into the
process....??