An emergency ambulance with switched on siren passes a person who is standing at the street.
Note: This applet is not very realistic in one respect: As the Doppler effect should be seen as clearly as possible, the sound waves have a smaller velocity than in reality.
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URL: http://www.walter-fendt.de/ph14e/dopplereff.htm
© Walter Fendt, February 25, 1998
Last modification: January 18, 2003