The change in observed frequency due to relative motion between source and observer.
This effects both light and sound. It is caused by a change in wavelength of the sound or light as a object moves relative to the observer. If the object is moving towards the observer the wavelength is compressed, if it moving away the wavelength is stretched. The apparent effect for light is the objects visible light is altered, the spectrum is shifted towards blue if an object approaches (blueshift) and towards red if the object recedes (redshift). The effect for sound is a change in the pitch. The amount of change is determined by the relative velocity of the object.
A phenomenon that causes electromagnetic or compression waves emanating from an object to have a longer wavelength if the object moves away from an observer than would be the case if the object were stationary with respect to the observer, and to have a shorter wavelength if the object moves toward the observer; it is the physical phenomenon that forms the basis for analysing certain sonar data and certain astronomical observations.
frequency/wavelength shift due to relative motions.
a phenomenon that causes waves to have a longer wavelength if the source and observer are moving apart and conversely becomes shorter if they are moving together. Very useful effect for flow and speed measurement
change in the apparent frequency of a wave as observer and source move toward or away from each other
a change in frequency of a wave that is reflected from or emitted by a moving object or is measured by a moving observer
a change in the frequency of a signal due to the motion of the platform emitting the signal, with the frequency increasing as the platform approaches and decreasing as the platform moves away
a change in the wavelength of light caused by the movement of the object that is emitting the light
the change in the tone of a sound caused by the sound source moving away or towards the listener
A change in pitch caused by a relative motion between the sound source and an observer. The pitch is higher when the source and observer are getting closer, and lower when they are moving apart. A mathematical analysis is given in the physics section.
A change in the wavelength of radiation received from a source because of its motion along the line of sight. A Doppler shift in the spectrum of an astronomical object is commonly known as a redshift when the shift is towards longer wavelengths (the object is moving away) and as a blueshift when the shift is towards shorter wavelengths (the object is approaching).
The resulting frequency change caused by the relative motion along a line of sight between two observers.
Physical phenomenom occuring when an observer and a source of acoustic or electromagnetic vibration are moving relative to each other. It produces a variation in frequency of the wave received by the observer. This frequency increases or decreases according to whether the observer and the source are moving closer together or further apart. In the Argos system, the Doppler shift is used too locate platforms.
Change in frequency of a sound wave or electromagnetic wave when the vibration source and observer are in motion relative to each other. In the Argos system this translates as the difference between: transmit frequency, and the frequency received by the satellite.The processing centers compute your transmitter's location from the difference between the computed transmit frequency and the frequency measured on board the satellite.
The change in length of a wave (light, sound, etc.) due to the relative motion of source and receiver. Things moving toward you have their wavelengths shortened. Things moving away have their emitted wavelengths lengthened.
change in frequency (or wavelength) of light caused by motion of source towards or away from observer: for v c, z = (change in wavelength)/(original wavelength) = v/c. The shift is in the sense that motion away from the observer gives larger wavelength (smaller frequency; redshift), motion towards gives smaller wavelength, larger frequency, blueshift.
This is the change in the frequency of a signal caused by the movement of the transmitter relative to the receiver.
Changes in wavelength caused by the motion of a radiating source or of the receiver are called doppler shifts in the radiated wavelengths. When a radiating source, emitting either sound or electromagnetic waves, moves either toward or away from an observer, the motion affects the wavelengths as seen by the observer. If the motion of the source is toward the observer, the wavelengths are shortened so that sound is increased in pitch and light shifted toward the blue end of the spectrum. Motion away from the observer decreases the pitch of sound and shifts electromagnetic radiations toward the red.
The apparent change in the frequency of a signal caused by the relative motion of the transmitter and receiver.
Generic term encompassing redshift and blueshift.
The apparent change, in the frequency of a signal, caused by the relative motion of the receiver and transmitter.
If a galaxy is moving towards our Galaxy, or away from it, the light we see coming from that galaxy appears different from what it would be if the galaxies were 'standing still'. If the two galaxies are approaching each other, the light becomes higher in frequency (shifted towards the 'blue' end of the spectrum). If the galaxies are moving further apart, the light becomes lower in frequency (shifted towards the 'red' end of the spectrum). As most of the galaxies we see are moving away from ours, this redshift effect is much more common than a blueshift. The Doppler shift applies to radio waves and other forms of radiation as well as to light. (It also applies to sound.)
(or Doppler Effect) - the change in frequency with which energy from a given source reaches an observer when the source and the observer are in motion relative to each other
Named for Johann Doppler (1803-1853), the German physicist who first predicted it: it is the shift in frequency caused by radial motion between a source and an observer. Specifically, (v/c): Where D is the Doppler-shifted frequency, S is the source frequency, is the relative velocity between source and observer, and is the speed of sound.
The apparent change in wavelength of sound or light caused by the motion of the source, the observer, or both. Waves emitted by a moving object as received by an observer will be blueshifted (compressed) if approaching or redshifted (elongated) if receding. It occurs both in sound and light. How much the frequency changes depends on how fast the object is moving toward or away from the observer.
Change in wavelength due to relative motion source and detector. The change in the wavelength of sound emitted by a moving source. (Ex. Moving Fire Truck Siren, Moving Car Horn, Moving Train.)
Change in wavelength due to relative motion between source and detector. Duc de Broglie, Louis Victor Pierre Raymond 1892-1987, demonstrated that a (small) particle may be represented by a wave, Nobel Prize 1929. Efficiency Mostly the ratio of useful power to total power, also applicable to other quantities. Einstein, Albert 1879-1955, conceived the Special and General Theories of Relativity, Nobel Prize 1921.
A change in the wavelength of waves from a source reaching an observer when the source and the observer are moving with respect to each other along the line of sight; the wavelength increases ( red shift) or decreases ( blue shift) according to whether the motion is away from or toward the observer, respectively.
A shift in an object's spectrum due to a change in the wavelength of light that occurs when an object is moving toward or away from Earth.
The change in the frequency of waves that occurs when the emitter or the observer is moving toward or away from the other.
The shift in wavelength of light or other electromagnetic radiation due to the motion of the source relative to the observer. Such observations are used to detect extrasolar planets.
The Doppler shift (or Doppler Effect) is an increase or decrease in wavelength as the object emitting the wave moves relative to the observer. For example, a train whistle seems to be higher in pitch when the train is approaching you (the waves are compressed, shortening the wavelength), and lower in pitch when it is traveling away from you (the waves are elongated, lengthening the wavelength). The same thing happens with light waves when the light source is coming or going relative to us. For example, when a star is travelling away from Earth, its light appears redder (the light waves are elongated, lengthening the wavelength); this is called the red shift. The expansion of the universe was discovered when E. Hubble observed that the light from almost all other galaxies was red-shifted. The Doppler effect was named for Johann Christian Doppler (November 29, 1803-March 17, 1853), who first realized that it existed (1842).
Waves produced by a source that is moving with respect to the observer will seem to have a higher frequency and smaller wavelength if the motion is towards the observer, and a lower frequency and longer wavelength if the motion is away from the observer. The speed of the waves is independent of the motion of the source.