Sunday, July 24, 2011

Doppler effect

Since sound travels as a wave, if you move the source of that sound, the waves will be pushed closer together (higher tone) or further apart (lower tone). This is the source of the doppler effect, as you can hear when a firetruck goes past, or in this rotating speaker by ISOGAWAYoshihito. This is also the source of the red shift that indicates that other galaxies are moving away from us.

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