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Doppler Effect

Astronomy  Doppler Broadening  Doppler shift

Doppler Effect - U of Illinois
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How sound travels though different media - GSU
Video: Seeing sound waves
Wavelength shift for moving objects - University of Oregon
Doppler shift to measure how fast an object is moving - Virginia U ...


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.
double star
A group of two (or more) stars that appear to the naked eye to be one, but can be separated into two with a powerful enough instrument.

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. Waves emitted by a moving object as received by an observer will be blueshifted (compressed) if approaching, redshifted (elongated) if receding.

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
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.

Doppler effect
The apparent change in wavelength of radiation due to relative motion between the source and the observer along the line of sight.
Doppler shifted
See Doppler_effect.

Doppler Effect
A change in the wavelength of radiation due to relative radial motion of the source and the observer.
Double Galaxy Method ...

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. An object receding from an observer would exhibit a frequency shift toward a lower frequency (red shift) and vice-versa.

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.
(b) An apparent change in the frequency of a wave motion, caused by relative motion between the source and the observer.

Doppler effect Electromagnetic waves emitted from a moving point source appear compressed ahead of, and more spread out away from, the direction of motion.

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
Dorsum- a ridge
Double-star system- a system of two stars in orbit around each other ...

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. This is the same effect you experience when an ambulance or a train passes by.

THE DOPPLER EFFECT AND LINE BROADENING
The spectra of many atoms and ions are well known from laboratory measurements. Often, however, a familiar pattern of lines appears, but the lines are displaced from their usual locations.

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. A common example of this effect is the sound made by a passing ambulance.

THE DOPPLER EFFECT
Before looking at the velocity information that is contained in stellar spectra, it is necessary to understand the Doppler Effect.

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
Index ...

[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 HII Region Jupiter Newton's Law Orbits Dimension Imaging Dark Matter Sunset Bosons Calendars Money Hydrostatic Equilibrium Redshift Magnification Wolf-Rayet Stars Pulsars Solar System Non-baryonic Matter Collapse
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Doppler Effect
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.

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 shift, &#Delta&#gamma, is defined as the difference between the observed and rest (laboratory) wavelengths for a given spectral line.

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.

Just as the Doppler effect causes sound from moving vehicles to change pitch, redshift causes light from moving stars to change color as its wavelength gets stretched by expanding space.

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 towards (or away from) the observer.

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. E ...

(The word "prograde" is sometimes used to mean "direct" in this sense.) diurnal daily, diurnal motion is daily motion, ie sun's apparent motion from east to west doppler effect the apparent change in wavelength of sound or light caused by the motion of the source, observer or both.

BL Lacertae object blueshift A wavelength shift toward shorter wavelengths due to approach of the emitting object; see Doppler effect. blue stellar object Non-radio-emitting quasar identified by its bright ultraviolet radiation and pronounced redshift.

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, appear to send out a train of waves of slightly shorter wavelength than that characteristic of a stationary molecule, ...

Blue shift A decrease in the wavelength of the radiation emitted by an approaching celestial body as a consequence of the Doppler effect; a shift toward the short-wavelength (blue) end of the spectrum.

RED SHIFT: Shift in the light of a retreating object toward red wavelengths, caused by the Doppler effect.
REDSHIFT: A shift in the lines of an object's spectrum toward the red end. Redshift indicates that an object is moving away from the observer.

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).

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." The light from material moving toward us is shifted toward the blue end of the spectrum while light from material moving away from us is shifted toward the red end.

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. The ratio of the rotational period to the orbital period is 2/3, and is an example of more complicated tidal locking than for the Earth-Moon system.

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.

Blue shift: Apparent shortening of the wavelength due to Doppler effect, of radiation received from a source in motion toward the observer.
Brown Dwarf: Either a supermassive planet or a failed star, a brown dwarf has insufficient mass to sustain nuclear fusion.
C ...

Space Definitions - Y Topics
Astronomy and Space Online Dictionary and Glossary
Venus
Does the Doppler Effect Happen in Light?
What is Elastic Collision?
The Doppler Effect for Sound Waves ...

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. This allows the mass and orbital characteristics of the unseen planets to be determined.

Tiny gravitational pulls of the moon on the spacecraft, equal to just one part in a trillion, could modulate the carrier signal by changing its frequency. These variations are caused by the Doppler effect - a change in the wavelength of radiation emitted by an object as it moves closer (shorter ...

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. The rocket reached an altitude of 3,779 feet.

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 by the planet orbiting the star and moving it ...

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.

systems use shorter, often visible wavelengths and can be used to produce a holographic recording of all objects within a volume, say a solar system; the shorter wavelength the better, to detect dust-like nanoswarms- these can usually be distinguished by their pattern of movement. Doppler effects ...

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 in their orbit.

From this he inferred that the galaxies exhibiting such "red shifts" were moving away from Earth, a conclusion he based on the Doppler effect. This effect, discovered by Austrian mathematician and physicist Christian Doppler in 1842, arises from the relative motion between a source and an observer.

are moving away from us will become shifted towards 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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