Definition: Doppler Effect: The apparent change in wavelength of sound or light caused by the motion of the source, observer or both.
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The Doppler Effect
S-4A-2 The Frequency Shift and the Expanding Universe
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Doppler Effect
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Doppler Effect
When the source of some wave is approaching you, the wave you received will be in a higher frequency (shorter wavelength) compared to the case when the source is stationary.
Doppler effect Any motion-induced change in the observed wavelength (or frequency) of a wave.
Doppler effect (C.J.Doppler)
The apparent change in wavelength of sound or light caused by the motion of the source, observer or both.
Doppler effect -- The effect on frequency imposed by relative motion between transmitter and receiver. See Chapter 6.
Downlink -- Signal received from a spacecraft.
DSOT -- Data System Operations Team, part of the DSMS staff.
Doppler Effect
A change in the wavelength of radiation due to relative radial motion of the source and the observer.
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DOPPLER EFFECT - Change in frequency of a wave (light, sound, etc.) due to the relative motion of source and receiver. Approaching objects have their wavelengths shortened. Receding objects have emitted wavelengths lengthened.
Doppler effect. The change in frequency (or wavelength) of light (or other radiation) caused by the motion of an object or the observer.
Doppler Effect - The change in the frequency of a wave (such as electromagnetic radiation) caused by the motion of the source and observer toward or away from each other ...
Doppler Effect
(a) The alteration in frequency of electromagnetic radiation due to relative motion between the source and observer.
Doppler effect- change in the observed frequency of sound or radiation that takes place when the observer and the source are moving relative to each other
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Doppler Effect
Another thing that you can get from an absorption or emission spectrum is the velocity of the object producing the spectrum. This is due to the Doppler effect.
The Doppler Effect
The Doppler effect refers to the apparent shift in the wavelength (and frequency) of a wave when there is relative motion between the source or emitter of the wave and an observer.
[edit] Doppler effect for a moving black body
The Doppler effect is the well known phenomenon describing how observed frequencies of light are "shifted" when a light source is moving relative to the observer.
Doppler Effect
The change in the wavelength of sound or light waves caused when the object emitting the waves moves toward or away from the observer; also called Doppler Shift.
Doppler effect
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Doppler Effect Apparent change in wavelength of the radiation from a source due to its relative motion away from or towards the observer.
Doppler effect
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Doppler effect (C.J. Doppler)
The apparent change in of sound or light caused by the motion of the source, observer or both. Waves emitted by a moving object as received by an observer will be (compressed) if approaching, (elongated) if receding.
Doppler effect - (n.)
The shift in wavelength of light that is caused by relative motion between the source of light and the observer.
Discovery of the 'Doppler Effect' by Austrian physicist and mathematician, Christian Doppler.
1843 A.D.
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In the case of an emitting gas, for example, those molecules which are approaching the observer as they emit quanta of radiant energy will, because of the Doppler effect, ...
One known cause of red shift is the doppler effect, which shifts the wavelength of emitted light of celestial objects toward the red (longer wavelengths) when the objects are moving away from the earth because of the expansion of the universe.
On the other hand, if redshifts are not Doppler effects, these anomalies disappear and the region observed appears as a small, homogeneous, but insignificant portion of a universe extended indefinitely both in space and time.
J anssen from the summit of Mont Blanc, but the only unquestionable test is to find those lines which are not touched by Doppler effect when the receding and advancing limbs of the sun are compared (Cornu); by this method H. F.
In addition, measurements of the Doppler effect in the spectral lines show that there is a vortex motion in sunspots similar to that of a tornado on earth.
The Doppler shift (or Doppler Effect) is an increase or decrease in wavelength as the object emitting the wave moves relative to the observer.
This effect, called the Doppler effect, is similar to what happens to sound waves emitted from a moving object.
But there is also a way of measuring a star's movement by using the Doppler effect. If you ever stand on the side of a highway while a car rushing by blows its horn, you'll notice a change of pitch.
The velocity of the material flowing in these loops can be determined using the "Doppler effect.
As the spectra of these stars vary due to the Doppler effect, they are called spectroscopic binaries. Radial velocity studies can be used to estimate the masses of the stars, and some orbital elements, such as eccentricity and semimajor axis.
In atomic physics, Doppler broadening is the broadening of spectral lines due to the Doppler effect in which the heat movement of atoms or molecules shifts the apparent frequency of each emitter....
of the fuel's neutron cross-section.
Sound spreading in air registers differently whether the observer approaches the source or recedes from it ("Doppler effect"), and so does light--that is how we tell distant galaxies are receding.
This is a demonstration of a phenomenon called the Doppler effect. It results from the motion of a source coming towards, and going away from an observer.
(The "Doppler effect" causes shifts in the wavelengths of light as a result of motion toward or away from the observer.) Assume a single star.
Its rotational period is 59 days, as determined by radar measurements from the Earth using the Doppler effect.
Using the Doppler effect, which reddens the light from receding objects, astronomers measured a redshift of 4.5, corresponding to a distance of 11 billion years.
The Doppler effect, life and work of Milton Humason
The four-dimensional universe
God vs. an infinite universe; myths of creation, esp. Hindu cosmology
Contracting and re-expanding vs. ever-expanding universe ...
the maser photons must seek paths that maintain good coherence in the component of the velocity along the line-of-sight; otherwise the transition frequencies of molecules encountered by the maser photons would be shifted by the Doppler effect, ...
Blue shift: Apparent shortening of the wavelength due to Doppler effect, of radiation received from a source in motion toward the observer.
These variations are caused by the Doppler effect - a change in the wavelength of radiation emitted by an object as it moves closer (shorter wavelengths) or further way (longer wavelengths) from an observer.
Here are some web pages related to the nature of light: All About Spectra and related links on Spectral Emission Lines and The Doppler Effect, and X-rays and Gamma Rays ...
created an experiment involving an alternate means for measuring the velocity of their rocket as it flew. Through the experiment, the team used the Doppler effect to determine the rocket's velocity using radio transmissions.
There are two main methods of detecting extrasolar planets, which are too faint to be detected by present conventional optical means. The first involves measuring the displacement in the parent star's spectral lines due to the Doppler effect induced ...
In these systems the spectrum is dominated by one of the two stars. Spectroscopic binary systems are usually detected due to the movement of the emission and absorption lines in the observed spectrum, caused by the Doppler effect as the stars move ...
disk The visible surface of the Sun (or any heavenly body) projected against the sky. Doppler effect The apparent change in wavelength of sound or light caused by the motion of the source, observer or both. dorsum A ridge.
In addition to showing the relief and textural properties of the surface (as noted earlier), these signals showed the effect of a shift in frequency characteristic of moving bodies (the Doppler effect).
red, and may shift so far that it is no longer visible at all. (Note: You hear the same effect when an ambulance passes you, and the pitch of the siren gets lower as the ambulance travels away from you; this effect is called the Doppler Effect).
See also Doppler effect. bluff body (NASA Thesaurus / NASA SP-7, 1965) A body having a broad, flattened front, as in some reentry vehicles.
 See also: Light, Earth, Distance, Solar, Sun
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