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Re: [Phys-l] sound advice

-----Original Message-----
From: [mailto:phys-l-] 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

Have you tried this with an array of people?