Doppler effect

"Change in apparent frequency of a periodic signal such as a pressure wave or light due to movement of the emitter or receiver." [1]

"The change in the observed frequency of a wave caused by the time rate of change in the length of the path of travel between the source and the observer." [2]


  1. Ewing AW. Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
  2. Broughton WB. Glossarial Index. Dans: Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith