Illustration of the Doppler effect or Doppler shift. It is the change in frequency of a wave for an observer moving relative to its source. It is heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. premium vector by Furian

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motion ambulance sound fire exchange frequency speaker crest waves different police megaphone physics Horn rescue Stretching siren acoustics bugle sirens shift pitch wavelength deformation higher Doppler deeper acoustically sound waves drive by doppler effect doppler shift sine curve signal source

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