The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It is named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an obser...
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The frequency of any wave phenomenon appears greater to an observer moving away
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The change in wavelength of sound or light emitted by an object in relation to an observer’s position. An object approaching the observer will have a shorter wavelength (blue) while an object moving away will have a longer (red) wavelength. The Doppler effect is used to estimate an object’s speed and direction.
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A phenomenon in which waves appear to compress as their source approaches the observer or stretch out as the source recedes from the observer.
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the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by ... [23 related articles]
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the phenomena that the frequencies of waves are blue-shifted when the source moves toward the observer and red-shifted when the source moves away from the observer.
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http://www.chemistry-dictionary.com/definition/doppler+effect.php
The change in the observed frequency of sound or light that occurs when the observer and the source are in relative motion. Examples of the Doppler effect in everyday life include the change in pitch of the siren of an ambulance or police car as it speeds past. The Doppler effect is important in ast...
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The shift in the frequency of a received radio signal due to the relative motion of the transmitter and receiver.
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The change in frequency (or wavelength) of light (or other radiation) caused by the motion of an object or the observer. An object receding from an observer would exhibit a frequency shift toward a lower frequency (red shift) and vice-versa.
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<radiobiology> Variation in the frequency of a wave (as measured by an observer) due to relative motion between the observer and the source of the wave. (The observed frequency increases if the source is moving towards the observer and vice versa.) The equation can be found in most optics texts and many introductory physics texts. ... (09 Oct...
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(dop´ler) the relationship of the apparent frequency of waves, as of sound, light, and radio waves, to the relative motion of the source of the waves and the observer; the frequency increases as the two approach each other and decreases as they move apart. The Doppler effect can be experienced when a train whistle ...
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(or Doppler shift) after Austrian physicist Christian Johann Doppler (1803–1853).
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The effect on frequency imposed by relative motion between transmitter and receiver. See Chapter 6.
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Type: Term Pronunciation: dop′lĕr Definitions: 1. a change in frequency observed when the sound source and observer are in relative motion away from or toward each other. Synonyms: Doppler phenomenon
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The Doppler effect is a change in observed wavelength due to relative motion between the source and observer.
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The apparent change in wavelength of sound or light emitted by an object in relation to an observer's position. An object approaching the observer will have a shorter wavelength (blue) while an object moving away will have a longer (red) wavelength. The Doppler effect can be used to estimate an object's speed and direction.
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The apparent change in wavelength of sound or light caused by the motion of the source, observer or both.
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[
n] - change in the apparent frequency of a wave as observer and source move toward or away from each other
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A change in the frequency of a periodic wave due to the motion of the observer, the source, or both.It occurs both in sound as well as electromagnetic phenomena, although it takes on different forms in each.Source toward stationary observerSource away from stationary observerObserver toward stationary sourceObserver away from stationary sourcewhere...
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Doppler shift noun change in the apparent frequency of a wave as observer and source move toward or away from each other
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Change in the observed frequency (or wavelength) of waves due to relative motion between the wave source and the observer. The Doppler effect is responsible for the perceived change in pitch of a siren as it approaches and then recedes, and for the red shift of light from distant galaxies. It is named after the Austrian physicist Christian Doppler
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(often l.c.) the shift in frequencyof acoustic or electromagnetic radiation emitted by a source moving relative to an observer as perceived by the observer: the shift is to higher frequencies when the source approaches and to lower frequencies when it recedes.
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