Re: pinhole Determination of wavelength

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Fri Feb 11 2005 - 11:31:43 PST 

Message-Id: <l03110777be32b82a3850@[192.168.112.4]>
Date: Fri, 11 Feb 2005 11:31:43 -0800
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole Determination of wavelength

Hi Eric

It comes from The Physics of Musical Instruments by Fletcher and Rossing

;-)

Actually it is the result of the cylindrical plug of compressed air
propagating down the cylindrical tube suddenly ecountering an open end and
then expanding spherically. There is a transition from cylindrical to
spherical that takes a distance related to the diameter of the pipe.

Paul D

>OK, Paul, where does the 0.61 come from? It seems like a pretty big
>factor. We've been doing the old speed of sound lab with PVC and tuning
>forks and have never taken it into account. I guess the small radius of
>the PVC keeps us pretty accurate.
>"Add 0.61 times the radius of the pipe for each open end."
>
>
>--Eric F.
>
>
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