Klarinet Archive - Posting 000377.txt from 2000/08

From: "Keith" <100012.1302@-----.com>
Subj: [kl] RE: Body movement
Date: Tue, 15 Aug 2000 09:47:30 -0400

Yes David, and if you are REALLY sharp, run backwards as fast as you can!

Bill is right, the Doppler shift is enough to be heard.

I sometimes do a cool lecture demo playing something simple like a recorder.
Play a steady note and walk towards a wall. (Of course, you need marching
band practise to be able to keep it steady ... nooooo, don't go near that!).
Then you get nice rapid beats between the note you are hearing and the
Doppler-shifted note coming back. The audience hears them too (though at a
slightly different frequency!).

This makes a great analogy to an aspect of dynamical theory of X-ray
diffraction, as I am sure you all wanted to know.

Keith Bowen

> Date: Mon, 14 Aug 2000 22:54:18 -0400
> To: "KLARINET" <klarinet@-----.org>
> From: "David B. Niethamer" <dnietham@-----.edu>
> Subject: Re: [kl] Body movement
> Message-Id: <200008150252.e7F2qJ327133@-----.edu>
>
> on 8/4/00 1:09 PM, William Wright wrote:
>
> >That is, 440 hz would become 438.8 hz. When you consider that
> >orchestras argue over 440 hz vs 443 hz, the Doppler Effect could perhaps
> >make a noticeable difference under extreme circumstances!
> > If you do the same math and assume 4 ft/sec directly towards the
> >audience, the factor becomes .9960, and then 443 hz would become 441 hz.
> >I really can't imagine tone holes moving faster than 4 ft/second.
>
> I'll remember this the next time I feel I'm playing slightly sharp!! And
> I'll try to clear 4 feet in front of my chair in the orchestra. ;-)
>
> David
>
> David Niethamer
> Principal Clarinet, Richmond Symphony
> dnietham@-----.edu
> http://members.aol.com/dbnclar1/
>

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