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Doppler Effect

Astronomy  Doppler Broadening  Doppler shift

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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Doppler Effect
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Doppler Effect
The apparent change in the wavelength of waves due to the relative movement of the source of the waves relative to the observer.

Doppler effect Any motion-induced change in the observed wavelength (or frequency) of a wave.

Doppler effect
The Doppler effect (or Doppler shift) is an increase or decrease in the wavelength of the radiation emitted by an object, as observed from Earth, as the object moves relative to the observer.

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
A measurable shift in the wavelength of a traveling wave caused by the relative motion of the source and 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.

The Doppler Effect
You will know the Doppler effect as the falling note of a car or train horn as it approaches, passes, and then goes away from you.

The Doppler Effect
S-4A-3 Rotating Galaxies and Dark Matter
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[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 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.

The Doppler effect is 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 relative motion of the observer and the wave source.

But during the oscillations, matter and radiation also move into and out of the compressed region, thus inducing a Doppler effect and a consequent increase (or decrease) in the observed temperature according to whether the fluid is moving ...

BL Lacertae object blueshift A wavelength shift toward shorter wavelengths due to approach of the emitting object; see Doppler effect.

Discovery of the 'Doppler Effect' by Austrian physicist and mathematician, Christian Doppler.
1843 A.D.
Germany ...

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, ...

pulse Doppler radar (NASA Thesaurus) A pulse radar system which utilizes the Doppler effect for obtaining information about the target (not including simple resolution from fixed targets).

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.

" All you known is what the curve looks like as measured from the earth, not what it would have looked like without the Doppler effect (i.e. if you had somehow been able to sit on the surface of the star and measure the curve there).

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.

(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.

Slipher's spectrum showed the light from Andromeda was "blueshifted", which meant its light waves were compressed by the Doppler effect to appear more "blue" as a consequence of its motion towards our solar system.

@Siosilvar
The light is redshifted because of the Doppler Effect not because its doing work against gravity and losing energy; that would be gravitational redshift. More specifically it's the Relativistic Doppler Effect.

The technique employed involves the detection through the Doppler effect of periodic variations in the motion of parent stars which is attributed to the presence of planets.

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 ...

STIS relies on the Doppler effect to measure gas velocity rapidly increasing to nearly 240 miles per second within 26 light years of the center of M84, a galaxy in the Virgo Cluster about 50 million light years away.

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 ...

Such a relative motion causes a Doppler effect on the light (or radio waves) coming into the telescope. This can cause the frequency of the emission (or absorption) line that you are looking at to shift.

This occurs as the wavelengths of light stretch as an object moves away (as opposed to being squashed by an approaching object), similar to the familiar Doppler effect on sound waves.

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.

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: See also: Astro, Earth, Star, Orbit, Sun

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