`doppler-effect` Related Article Results

The Doppler effect is the phenomenon in which the frequency or wavelength of a wave, as measured by an observer, changes due to the relative motion between the wave source and the observer. When the source approaches the observer, the perceived frequency increases (wavelength shortens), and when the source recedes, the frequency decreases (wavelength lengthens). This physical phenomenon was first described by Austrian physicist Christian Doppler and has broad applications ranging from acoustics