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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John Denker
Sent: Wednesday, April 09, 2008 5:35 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] sound advice
Also outdoors: Find someplace on campus where there is a set of
evenly-spaced architectural features ... which you can use as a
_diffraction grating_ for sound. A big set of steps will sorta
do, but it is much nicer to have an array of features that run
/vertically/ so that by walking horizontally you can scan the
different frequencies in the diffraction pattern. (The analogous
scan for steps would involve moving vertically, which is less
convenient.)