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Christian Andreas Doppler 1803-1853  Doppler was an Austrian physicist who is now most famous for his discovery of what is now termed "The Doppler Effect".  The Doppler Effect shows a wave source (such as a siren on an ambulance) creating sound waves, which ripple out from the source. 
 * Welcome to the Doppler Wiki! ** 

The Doppler Effect is the apparent change in frequency and wavelength of a wave as perceived by an observer moving relative to the wave's source. This is usually most apparent when dealing with sound waves. The Doppler Effect yields a sound that changes pitch--is perceived at a higher pitch--if the source of the sound is moving away from the listener.

Knowledge of wave properties has allowed the medical industry to develop Doppler ultrasound equipment for viewing babies in the womb and for obtaining other information about people's health.

 We'll be learning more about the Doppler Effect later in the year!

