Introduction to the Doppler Effect
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The moving source emits constant wavelengths. To an observer in front, the wave fronts are pushed together. To an observer behind, they are spread out.
Contributed by: Tim Brophy (March 2011)
Open content licensed under CC BY-NC-SA
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"Introduction to the Doppler Effect"
http://demonstrations.wolfram.com/IntroductionToTheDopplerEffect/
Wolfram Demonstrations Project
Published: March 7 2011