The Doppler Effect: what does motion do to waves?

A visual explanation of the Doppler effect.

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Created with Toon Boom Studio 6.
Car sound: http://en.wikipedia.org/wiki/File:Speeding-car-horn_doppler_effect_sample.ogg
Night sky image: http://en.wikipedia.org/wiki/File:Vermont_night_sky_stargazing.JPG

Video from The Big Bang Theory is the property of its creators, used here under fair use.