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from the ExploreScience site of Raman Pfaff at the University of Michigan, Ann Arbor.
http://www.explorescience.com/activities/activity_list.cfm?categoryID=3
In order to use this site you must download and install the Macromedia Shockwave Plug-in on your computer.
These activities -- Sound Pulses, Sonic Doppler Effect and Two Source Doppler Effect all display animated sonic phenomena and allow you to manipulate variables and make onscreen measurements.
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