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Sound waves

  1. Sep 5, 2010 #1
    I'm just curious on how can sound waves be used to detect if cars are over the speed limit? :)
     
  2. jcsd
  3. Sep 5, 2010 #2
    http://en.wikipedia.org/wiki/Doppler_effect" [Broken]
     
    Last edited by a moderator: May 4, 2017
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