The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference between the observed frequency and the emitted frequency of a wave for an observer moving relative to the source of the waves.
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The Academy is also a learned society, and its past members have included Christian Doppler, Theodor Billroth, Anton Eiselsberg, Eduard Suess, Ludwig Boltzmann, Paul Kretschmer, Hans Horst Meyer, Roland Scholl, and the Nobel Prize winners Julius Wagner-Jauregg, Victor Hess, Erwin Schrödinger and Konrad Lorenz.
The Doppler effect (or Doppler shift), named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague, is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source.