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Galaxies have their light shifted towards the red due to their speed of recession ... 
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WHISTLE FROM A MOVING TRAIN IS DUE TO THIS EFFECT, DOPPLER 
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with it. .... this website help me with a project that was due the next day, thanks. [DOC] [TLE] Doppler effect | Define Doppler effect at Dictionary.com [PAR] Doppler effect definition, (often lowercase) the shift in frequency (Doppler shift) of 
acoustic ... An apparent change in the frequency of waves, as of sound or light, ... 
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Question: The apparent change in the pitch of the whistle from a moving train is due to this effect
Answer: the Doppler effect