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- Doppler_effect abstract "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. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession.When the source of the waves is moving toward the observer, each successive wave crest is emitted from a position closer to the observer than the previous wave. Therefore each wave takes slightly less time to reach the observer than the previous wave. Therefore the time between the arrival of successive wave crests at the observer is reduced, causing an increase in the frequency. While they are travelling, the distance between successive wave fronts is reduced; so the waves "bunch together". Conversely, if the source of waves is moving away from the observer, each wave is emitted from a position farther from the observer than the previous wave, so the arrival time between successive waves is increased, reducing the frequency. The distance between successive wave fronts is increased, so the waves "spread out".For waves that propagate in a medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from motion of the source, motion of the observer, or motion of the medium. Each of these effects is analyzed separately. For waves which do not require a medium, such as light or gravity in general relativity, only the relative difference in velocity between the observer and the source needs to be considered.".
- Doppler_effect thumbnail Doppler_effect_diagrammatic.svg?width=300.
- Doppler_effect wikiPageExternalLink doppler.html.
- Doppler_effect wikiPageExternalLink dopplershift.html.
- Doppler_effect wikiPageExternalLink CL0113709540_1d645df0e.
- Doppler_effect wikiPageExternalLink EM_Propagation.html.
- Doppler_effect wikiPageExternalLink WaveDancer.html.
- Doppler_effect wikiPageExternalLink DopplerEffect.html.
- Doppler_effect wikiPageExternalLink 12532039.
- Doppler_effect wikiPageExternalLink applets_New.html.
- Doppler_effect wikiPageExternalLink ex-doppler.html.
- Doppler_effect wikiPageExternalLink doppler.html.
- Doppler_effect wikiPageExternalLink 2-04.htm.
- Doppler_effect wikiPageID "8724".
- Doppler_effect wikiPageRevisionID "606283619".
- Doppler_effect filename "Speeding-car-horn_doppler_effect_sample.ogg".
- Doppler_effect format Ogg.
- Doppler_effect hasPhotoCollection Doppler_effect.
- Doppler_effect title "Passing car horn".
- Doppler_effect subject Category:Doppler_effects.
- Doppler_effect subject Category:Radar_signal_processing.
- Doppler_effect subject Category:Radio_frequency_propagation.
- Doppler_effect subject Category:Wave_mechanics.
- Doppler_effect type Consequence111410625.
- Doppler_effect type DopplerEffects.
- Doppler_effect type Phenomenon100034213.
- Doppler_effect type PhysicalEntity100001930.
- Doppler_effect type Process100029677.
- Doppler_effect comment "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. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer.".
- Doppler_effect label "Doppler effect".
- Doppler_effect label "Doppler-Effekt".
- Doppler_effect label "Dopplereffect".
- Doppler_effect label "Efecto Doppler".
- Doppler_effect label "Efeito Doppler".
- Doppler_effect label "Efekt Dopplera".
- Doppler_effect label "Effet Doppler".
- Doppler_effect label "Effetto Doppler".
- Doppler_effect label "Эффект Доплера".
- Doppler_effect label "تأثير دوبلر".
- Doppler_effect label "ドップラー効果".
- Doppler_effect label "多普勒效应".
- Doppler_effect sameAs Dopplerův_jev.
- Doppler_effect sameAs Doppler-Effekt.
- Doppler_effect sameAs Φαινόμενο_Ντόπλερ.
- Doppler_effect sameAs Efecto_Doppler.
- Doppler_effect sameAs Effet_Doppler.
- Doppler_effect sameAs Efek_Doppler.
- Doppler_effect sameAs Effetto_Doppler.
- Doppler_effect sameAs ドップラー効果.
- Doppler_effect sameAs 도플러_효과.
- Doppler_effect sameAs Dopplereffect.
- Doppler_effect sameAs Efekt_Dopplera.
- Doppler_effect sameAs Efeito_Doppler.
- Doppler_effect sameAs m.02f2n.
- Doppler_effect sameAs Q76436.
- Doppler_effect sameAs Q76436.
- Doppler_effect sameAs Doppler_effect.
- Doppler_effect wasDerivedFrom Doppler_effect?oldid=606283619.
- Doppler_effect depiction Doppler_effect_diagrammatic.svg.
- Doppler_effect isPrimaryTopicOf Doppler_effect.
