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Topic: Relativistic Doppler effect

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	Doppler effect - Wikipedia, the free encyclopedia
		The Doppler effect, named after Christian Andreas Doppler, is the apparent change in frequency and wavelength of a wave that is perceived by an observer moving relative to the source of the waves.
		The use of the Doppler effect for light in astronomy depends on the fact that the spectra of stars are not continuous.
		Another use of the Doppler effect which is found mostly in astronomy, is the estimation of the temperature of a gas which is emitting a spectral line.
	en.wikipedia.org /wiki/Doppler_effect (1485 words)

	Doppler (Site not responding. Last check: 2007-10-10)
		The Doppler effect is observable for light, and is responsible for the so-called red-shift of the spectral lines from stellar objects moving away from the solar system.
		For velocities less than 10% of the speed of light, the same magnitude of Doppler shift is observed regardless of whether a target is moving toward the radar, or away from it, with a given velocity.
		For speeds greater than 10% of the speed of light, the magnitude of the Doppler shift is not the same in the cases of moving away from the radar and moving towards the radar.
	aa.1asphost.com /tonyart/tonyt/Applets/Doppler/Doppler.html (771 words)

	Relativistic Doppler effect - Wikipedia, the free encyclopedia
		The relativistic Doppler effect is the change in frequency (and wavelength) of light, caused by the relative motion of the source and the observer (like in the regular Doppler effect), when taking into account effects of the special theory of relativity.
		The relativistic Doppler effect is different from the true (non-relativistic) Doppler effect as the equations include the time dilation effect of special relativity.
		However, due to the relativistic time dilation, the observer will measure this time to be
	en.wikipedia.org /wiki/Relativistic_Doppler_effect (308 words)

	The Sagnac Effect As Cumulative Doppler Shifts
		The derivation is based on relativistic assumptions mainly, the speed of light in the reference frame of the rotating disk equals c.
		In this updated version, a more in depth discussion of the rationale on which the analysis is based and another derivation of the Sagnac effect equation for the case of square setup of the experimental device is presented in addition to the previous circular setup case presented in the original paper.
		Admitting the Doppler effect as the physical explanation of the Sagnac effect resolves the constancy of light velocity in proper reference frames and reestablishes the Sagnac experiment as a relativistic process.
	www.wbabin.net /yagan/yagan3.htm (934 words)

	sciforums.com - Relativistic Doppler Effect
		IOW, you cannot, by Doppler shift, determine whether you are moving towards the star or the star is moving towards you.
		Doppler relativistic effect depends from velocities of both the observer and the source, you are right.
		When talking about principles the doppler effect shows that it is generaly possible to be found out what is the velocity wrt the abs.
	www.sciforums.com /showthread.php?t=45377 (1375 words)

	Doppler Effect and Another Description of Relativistic Red Shifts
		The Doppler Effect is given by 1 / (1 - v/u) (for a stationary observer and no wind or other affecting causes), where v is the velocity (speed) along the line between the source and the observer, and u is the velocity of propagation.
		So, for a rapidly receding star, we would have TWO effects, Doppler and Time Dilation, both of which would cause us to see the spectral lines to be shifted toward the red end of the spectrum.
		This is a significant effect, and may now allow conventional physics to explain such a source, as it is not as far beyond traditional theory as previously thought.
	mb-soft.com /public/reltvty1.html (2161 words)

	The Doppler Effect
		To verify that this reduces to the usual relativistic Doppler effect for light rays between co-linearly moving transmitter and receivers, suppose the velocities u and v are in opposite directions, with v parallel to the light vector C, and with u anti-parallel.
		Here the numerator is the classical effect (for both a wave theory with the emitter at rest in the medium and for an emission theory), and the denominator is the relativistic correction due to time dilation.
		Classically it would follow that there was no Doppler effect, but the time dilation of special relativity implies that the proper time of the circling entity is reduced relative to the rest frame time coordinate of the central entity.
	www.mathpages.com /home/kmath587/kmath587.htm (1128 words)

	Doppler Shift
		Christian Johann Doppler (probably Döppler; 1803-1853) probably had such double stars in mind when he wrote in 1842 that perhaps the difference in colors were due to the motion of the stars, since the frequency of the light from an approaching star should be increased, and from a receding star decreased.
		The optical Doppler effect was not observed until 1905, when J. Stark found that the light emitted by canal rays, which are fast ions from the cathode of a glow discharge, was Doppler-shifted by the expected amount.
		Normally, the recoil of the nucleus after a γ ray is emitted lowers its energy by the Doppler effect, so that when it reaches another nucleus it is no longer resonant with the transition that gave it birth.
	www.du.edu /~jcalvert/phys/doppler.htm (2886 words)

	SPACE-TALK - Doppler effect (Site not responding. Last check: 2007-10-10)
		For that to be applicable to light's doppler effect, light speed would have to be limited by the medium through which it travels...
		This is later adjusted for the 'relativistic Doppler effect' in the diagram showing the centrifuge experiment, 1962 "Measurement of the Transverse Doppler Effect..", where the light is sent from a central source towards the perimeter of the centrifuge, at 9.3 cm distance, and spun at up to 35,000 rpm (or 583.3 rps).
		The centrifuge experiment, however, is not shielded from operating in Earth's gravitational field, so the relativistic result may be tainted by this fact, that light traveling at the increased velocity, i.e., 170 m/s, as measured on the perimeter of the centrifuge, is also traveling at that velocity within the gravitational field.
	www.space-talk.com /ForumE/showthread.php3?postid=23542 (2874 words)

	The Open Door Web Site : IB Physics : Relativity : The Relativistic Doppler Effect
		In the mathematical analysis of the Doppler effect we consider the motion of observer and source relative to the medium (the air) through which the sound travels.
		Hence, the mathematical analysis of the relativistic Doppler effect is fundamentally different from the Doppler effect in sound waves.
		The effect is used in the measurement of the speed of vehicles; especially cars and planes.
	www.saburchill.com /physics/chapters/0091.html (311 words)

	Physics 230 Lectures, Fall 2002
		Effect of moving a source, moving a listener and moving source and listener.
		Doppler shift for observer in a car approaching a red light.
		Doppler shift for spectral lines from a star recoiling due to planetary motion.
	dept.physics.upenn.edu /~mele/archives/webpage230/phys230.f02/log.html (763 words)

	Theory of Relativity, Part 1: Special Relativity - Numericana
		Doppler shift: The relativistic effect is not purely radial.
		The radial effect is multiplied by an isotropic relativistic factor.
		This relation was proposed by Einstein (1905) in his explanation of the laws of the photoelectric effect (for which he received the Nobel Prize in 1921) which may be construed as a formal discovery of the photon...
	home.att.net /~numericana/answer/relativity.htm (4292 words)

	Generalized Lorentz Transformations and Relative Rotation
		are the only one strictly consistent with the relativistic principle that the single parameter v fully characterizes the relative states of motion of two objects, but we can consider other possible factorizations while maintaining the relativistic speed composition rule.
		This is exactly the classical Doppler effect if the receiver is stationary and the source is approaching.
		Since the relativistic Doppler effect has been experimentally confirmed to second order, we know that a must equal 1/2, or at least be very close to 1/2, but it's interesting to note that this conclusion does not follow directly from the relativistic composition rule.
	www.mathpages.com /home/kmath188/kmath188.htm (874 words)

	Relativistic Doppler Effect
		The Doppler effect is observed with visible light and all other electromagnetic waves.
		For purposes of determining recession speed of stars and galaxies with the Doppler effect by observation of the red shift of spectral lines, it is convenient to express the Doppler effect in terms of the shift in wavelength compared to the source wavelength.
		From the Doppler shifted wavelength, the observed frequency is
	hyperphysics.phy-astr.gsu.edu /hbase/relativ/reldop2.html (254 words)

	Doppler effect - (Site not responding. Last check: 2007-10-10)
		The siren on a passing emergency vehicle will start out higher than its stationary pitch, slide down as it passes, and continue lower than its stationary pitch as it recedes from the observer.
		Image:Redshift.png The Doppler effect for electromagnetic waves such as light, is of great use in astronomy, and results in either a so-called redshift or blueshift.
		This is used to detect that an apparently single star is, in fact, a close binary and even to measure the speed of rotation of stars and galaxies.
	psychcentral.com /psypsych/Doppler_effect (1601 words)

	SparkNotes: Applications of Special Relativity: The Relativistic Doppler Effect
		The longitudinal Doppler effect considers the simpler case of a source moving directly towards you or away from you along a straight line.
		The transverse Doppler effect, on the other hand, considers what is observed when the observer is displaced in a direction perpendicular to the direction of the motion.
		The overall effect of the longitudinal Doppler shift is due to both the time dilation that occurs between the frames and the normal Doppler effect due to the motion of the source.
	sparknotes.com /physics/specialrelativity/applications/section1.html (956 words)

	Modern Physics:The Doppler Effect - Wikibooks, collection of open-content textbooks
		A similar, but distinct effect occurs if you are moving past a source of sound.
		However, by the principle of relativity, the laws of physics should be the same in the reference frame in which the observer is stationary and the source is moving.
		This is unlike the case for, say, sound waves, where the stationary observer and the stationary source yield different formulas for the Doppler shift.
	en.wikibooks.org /wiki/Modern_Physics:The_Doppler_Effect (461 words)

	[No title]
		Their scheme was clever: they designed their experiment so that even the very tiny difference between ordinary and relativistic Doppler effects would cause a perceptible change.
		Now, if Einstein is wrong, and there are no corrections to the ordinary Doppler effect, the spectrograph will record two wavelengths of light: one for the direct rays, and one for the reflected rays.
		In the classical world, an source of waves must be moving towards you or away from you in order for you to perceive a shift in the frequency (or wavelength) of its waves.
	spiff.rit.edu /classes/phys314/lectures/doppler/doppler.html (1415 words)

	Doppler Effects
		Apparent change in the wave frequency (or in the period of periodic events) due to motion of wave source and/or observer is known as Doppler effect.
		In the 17th century (well before Doppler effect was predicted), Roemer (Danish astronomer) estimated the speed of light from the change in the revolution period of one of Jupiter's moons.
		Therefore, the Doppler shifted frequency for a stationary sound source heard by a moving observer is given by
	physics.usask.ca /~hirose/ep225/animation/doppler/anim-doppler.htm (419 words)

	Essays Page (Site not responding. Last check: 2007-10-10)
		The redshifts of astronomical objects within the Galaxy are interpreted as Doppler shifts caused by movement of the source away from the observer.
		The redshifts of extragalactic sources, including quasars, are also interpreted in terms of the Doppler effect, which for these objects results from the expansion of the Universe.
		Although the redshifts of galaxies are often interpreted as being caused by the relativistic Doppler effect alone, both the expansion and the gravitational field of the Universe are involved.
	www.fofweb.com /subscription/science/Helicon.asp?SID=2&iPin=ffdastron2725 (276 words)

	The Cosmological Redshift Reconsidered
		The adoption of the special relativistic Doppler formula by many educators has led to a peculiar 'hybrid' cosmology which attempts to describe big bang cosmology using general relativity, but which is still firmly mired in the ruberik of special relativity.
		This means that the special relativistic Doppler formula should not, in fact cannot, be used to quantify the velocity of distant quasars.
		With the Doppler interpretation of the cosmological redshift at last reconsidered, and rejected, we will finally be able to embrace the essential beauty and mystery of cosmic expansion as it was originally envisioned by its discoverers.
	www.astronomycafe.net /cosm/expan.html (2192 words)

	Lecture Notes for Day 17
		Gravity is thus an inertial effect, like the flying out of the baby buggy of a baby when it is brought to a sudden stop; like your face smashing into the windshield of a car that stops suddenly; and like being thrown from a car when it suddenly turns.
		The Relativistic Doppler effect caused by the slowing down of time when an object is moving relative to an observer.
		The relativistic Doppler effect applies to galaxies moving close to the speed of light.
	www.colorado.edu /APAS/APAS1010/lecture/day.17.html (865 words)

	Doppler Effect and Sonic Booms
		However, the Doppler effect can also be observed when the sound source is stationary and the observer is moving.
		The equations already determined for the Doppler effect in sound also apply to nearby galaxies whose speeds are very much smaller than the speed of light.
		The Doppler effect occurs in all situations where there is relative motion between a sound source and an observer.
	www.crocodile-clips.com /absorb/AP5/sample/040103.html (2685 words)

	[No title]
		Pauli shows that this addition is made in terms of the requirement of the invariance of phase of a light wave and also it is the corollary of the transformation formulae for the values of fields (4-2-1)..(4-2-2).
		It means, according to Pauli, that relativistic Doppler effect varies both frequency and amplitude of a light wave, besides the one varies energy density of a light wave (the inverse proportionality for change of volume and energy).
		For such result to satisfy the requirement of phase invariance is possible only with a glance to the relativistic length contraction of a light wave like the solid measuring rod, i.e.
	www.pwaves.0catch.com /doc/english/e77.htm (495 words)

	Equations from Relativistic Transverse Doppler Effect
		Following is a complete list of all of the equations used in or derived in the Relativistic Transverse Doppler Effect paper.
		is the Doppler effect factor for wavelengths, λ;
		that are Doppler effected wavelengths, the variables used in Figure 7 and the remaining formulas have the same definitions given in Section 6 and may be used to correlate the special relativity formulas with the millennium relativity formulas.)
	www.mrelativity.net /Equations/Equations6.htm (1252 words)

	View topic - On the Interpretation of the Doppler Effect in Special Relat
		Einstein [1] presented the relations of the relativistic Doppler effect (RDE) in terms of Lorentz transformations (LT’s).
		That means that the light vary its frequency through Doppler relations to observe always that the light velocity remains at constant speed of c.
		The frequency shifts of photon-wave was derived using the physical law and relativity principle.
	www.anti-relativity.com /forum/about67.html (293 words)

	"Emergence"
		According to the principle of relativistic causality, casual influences cannot propagate faster then the speed of light, meaning events that have an inherent sequence of cause and effect cannot happen out of order, such as effect then cause.
		While debates between proponents of quantum theory and relativistic physics continue to this day, it is generally conceded that quantum entanglement does not actually violate the principle of causality.
		In a way not yet understood, it may be that the influence between two entangled particles does not travel at a superluminal speed between the pair, but may be traveling a geodesic path through space-time, a curved path that is the shortest path between two points.
	www.paganastronomy.net /eric.htm (6249 words)

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