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 An emergency ambulance with switched on siren passes a person standing at the street. 
 Note: This applet is not very realistic in one sense: As the Doppler effect should be seen as clearly as possible, the sound waves have a smaller velocity than in reality. 
 
 URL: http://home.a-city.de/walter.fendt/physengl/dopplerengl.htm Source file (German version): Doppler.java | 
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