Doppler effect

Also known as Doppler's principle, Doppler shift

frequency change of a wave for observer relative to its source

AI overview

The Doppler effect is the change in frequency of a wave that an observer perceives when either the observer or the source of the wave is moving. This matters because it explains everyday experiences like why a siren sounds higher-pitched as an ambulance approaches and lower-pitched as it moves away, and it's also used in practical applications like radar speed guns and astronomy.

AI-generated from the Wikipedia summary — may contain errors.

Research

19,651 papers

[Doppler effect in cardiology. Continuous Doppler, pulsed Doppler, Doppler color].ReviewPresse medicale (Paris, France : 1983) · 1988Houdas Y, Deklunder G, Consigny MC et al.
Doppler of the Doppler ultrasound effect.Gastroenterology · 2003Haubrich WSDOI: 10.1053/j.gastro.2003.10.024
Temporal Doppler Effect and Future Orientation: Adaptive Function and Moderating Conditions.Journal of personality · 2017Gan Y, Miao M, Zheng L et al.DOI: 10.1111/jopy.12242
Gait Classification Based on Micro-Doppler Effect.Sensors (Basel, Switzerland) · 2026Chen Y, Li S, Qin C et al.DOI: 10.3390/s26082390
The Doppler equation.ReviewEchocardiography (Mount Kisco, N.Y.) · 2004Pellett AA, Kerut EKDOI: 10.1111/j.0742-2822.2004.03146.x
Miniaturization of Laser Doppler Vibrometers-A Review.ReviewSensors (Basel, Switzerland) · 2022Li Y, Dieussaert E, Baets RDOI: 10.3390/s22134735
Christian Johann Doppler: the man behind the effect.The British journal of radiology · 2002Roguin ADOI: 10.1259/bjr.75.895.750615
Principles of Doppler and color flow.ReviewLa Radiologia medica · 1993Burns PN

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Wikidata facts

Image: Picture of the first 'wall formula' in the city of Utrecht 01.jpg

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time of discovery or invention: 1842-00-00
Commons category: Doppler effect
Commons gallery: Doppler effect
Stack Exchange tag: physics.stackexchange.com/tags/doppler-effect

Sources (4)

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Article

Change of wavelength caused by motion of the source An animation illustrating how the Doppler effect causes a car engine or siren to sound higher in pitch when it is approaching than when it is receding. The red circles represent sound waves.

The Doppler effect (also Doppler shift) is the change in the frequency or, equivalently, the period of a wave in relation to an observer who is moving relative to the source of the wave. It is named after the physicist Christian Doppler, who described the phenomenon in 1842. A common example of Doppler shift is the change of pitch heard when a vehicle approaches and recedes from an observer. Compared to the emitted sound, the received sound has a higher pitch during the approach, identical at the instant of passing by, and lower pitch during the recession.