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

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.

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.

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.

. 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.

- 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.

- 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 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.

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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.

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.

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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.

- (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 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 '' 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, ...

pulse Doppler radar (NASA Thesaurus) A pulse radar system which utilizes the 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 (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 , 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 ".

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 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 .

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

Astronomy  Doppler Broadening  Doppler shift

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