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EINSTEINIANA: FUNDAMENTAL CAMOUFLAGE
http://www.pitt.edu/~jdnorton/teachi...ang/index.html
John Norton: "Here's a light wave and an observer. If the observer were to hurry towards the source of the light, the observer would now pass wavecrests more frequently than the resting observer. That would mean that moving observer would find the frequency of the light to have increased (AND CORRESPONDINGLY FOR THE WAVELENGTH - THE DISTANCE BETWEEN CRESTS - TO HAVE DECREASED)." Clearly John Norton is desperately trying to camouflage the following truism: "If the wavecrests hit you more frequently, then their speed relative to you has increased" Quantitative analysis of the camouflage: IN THE FRAME OF THE SOURCE, the time the moving observer takes to pass two wavecrests (one wavelength = L) is: T = L/(c+v) where v is the relative speed of the source and the observer. This formula is compatible with both Newton's emission theory of light and Einstein's special relativity. Then the two theories diverge: According to Newton's emission theory of light, IN THE FRAME OF THE OBSERVER, the time the moving observer takes to pass two wavecrests (one wavelength = L') is: T' = L'/(c+v) = T = L/(c+v) and the frequency is: f' = (c+v)/L This result is valid for all waves; it takes a postscientific schizophrenic atmosphere to safely suggest that light waves are an exception. According to Einstein's special relativity, IN THE FRAME OF THE OBSERVER, the time the moving observer takes to pass two wavecrests (one wavelength = L') is: T' = L'/c and the frequency is: f' = c/L' Clearly L'L is indispensable fundamental camouflage. Yet it is so silly that some Einsteinians see it as a sword of Damocles suspended over their heads. Pentcho Valev |
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EINSTEINIANA: FUNDAMENTAL CAMOUFLAGE
On Sep 28, 12:38*am, Pentcho Valev wrote:
http://www.pitt.edu/~jdnorton/teachi...s/big_bang/ind... John Norton: "Here's a light wave and an observer. If the observer were to hurry towards the source of the light, the observer would now pass wavecrests more frequently than the resting observer. That would mean that moving observer would find the frequency of the light to have increased (AND CORRESPONDINGLY FOR THE WAVELENGTH - THE DISTANCE BETWEEN CRESTS - TO HAVE DECREASED)." Clearly John Norton is desperately trying to camouflage the following truism: "If the wavecrests hit you more frequently, then their speed relative to you has increased" Sigh. If that were true it would be possible to obtain a radar return from a closing target before transmitting a ping. It's not possible. Try it. Mark L. Fergerson |
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EINSTEINIANA: FUNDAMENTAL CAMOUFLAGE
On Sep 28, 2:38*am, Pentcho Valev wrote:
http://www.pitt.edu/~jdnorton/teachi...s/big_bang/ind... John Norton: "Here's a light wave and an observer. If the observer were to hurry towards the source of the light, the observer would now pass wavecrests more frequently than the resting observer. That would mean that moving observer would find the frequency of the light to have increased (AND CORRESPONDINGLY FOR THE WAVELENGTH - THE DISTANCE BETWEEN CRESTS - TO HAVE DECREASED)." Clearly John Norton is desperately trying to camouflage the following truism: "If the wavecrests hit you more frequently, then their speed relative to you has increased" Quantitative analysis of the camouflage: IN THE FRAME OF THE SOURCE, the time the moving observer takes to pass two wavecrests (one wavelength = L) is: T = L/(c+v) where v is the relative speed of the source and the observer. This formula is compatible with both Newton's emission theory of light and Einstein's special relativity. Then the two theories diverge: According to Newton's emission theory of light, IN THE FRAME OF THE OBSERVER, the time the moving observer takes to pass two wavecrests (one wavelength = L') is: T' = L'/(c+v) = T = L/(c+v) and the frequency is: f' = (c+v)/L This result is valid for all waves; it takes a postscientific schizophrenic atmosphere to safely suggest that light waves are an exception. According to Einstein's special relativity, IN THE FRAME OF THE OBSERVER, the time the moving observer takes to pass two wavecrests (one wavelength = L') is: T' = L'/c and the frequency is: f' = c/L' Clearly L'L is indispensable fundamental camouflage. Yet it is so silly that some Einsteinians see it as a sword of Damocles suspended over their heads. Pentcho Valev Pentcho, you're an idiot. Even in classical waves in a medium, it is simply not true that all increases in frequency are due to increased speed of the wave. Take the Doppler effect of sound in air. As a reminder, you can get the Doppler effect by either of TWO ways. 1. The receiver moves relative to the medium. 2. The source moves relative to the medium. In the FIRST case, you are right, that the speed of the wave relative to the observer has increased. In this case the wavelength stays the same, and the speed and the frequency increase. But in the SECOND case, the speed of the wave relative to the observer remains unchanged, and the wavelengths do become shorter. http://en.wikipedia.org/wiki/Doppler_effect Finally, your statement that "This result is valid for all waves" is just a bald assertion that is contrary to experimental data. Please catch up on freshman physics, before you make a further fool of yourself. |
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EINSTEINIANA: FUNDAMENTAL CAMOUFLAGE
Einsteiniana's fundamental camoflage has been triggered by the fact
that light is often frequency-shifted (that is, the frequency is obviously variable) while the formula: (frequency) = (speed of light)/(wavelength) says that variable frequency implies either VARIABLE SPEED OF LIGHT or VARIABLE WAVELENGTH. "Variable speed of light" is the most dangerous thought in the era of Postscientism - believers should NEVER go in that direction - so Einsteiniana's priests have been fiercely procrusteanizing the wavelength over the years, regadless of the absurdity involved. Curiously, the speed of light in Einstein's general relativity has aways been VARIABLE: http://www.speed-light.info/speed_of_light_variable.htm "Einstein wrote this paper in 1911 in German (download from: http://www.physik.uni-augsburg.de/an...35_898-908.pdf ). It predated the full formal development of general relativity by about four years. You can find an English translation of this paper in the Dover book 'The Principle of Relativity' beginning on page 99; you will find in section 3 of that paper Einstein's derivation of the variable speed of light in a gravitational potential, eqn (3). The result is: c'=c0(1+phi/c^2) where phi is the gravitational potential relative to the point where the speed of light co is measured......You can find a more sophisticated derivation later by Einstein (1955) from the full theory of general relativity in the weak field approximation....For the 1955 results but not in coordinates see page 93, eqn (6.28): c(r)=[1+2phi(r)/c^2]c. Namely the 1955 approximation shows a variation in km/sec twice as much as first predicted in 1911." In the era of Postscientism the fact that the speed of light has always been variable in Einstein's general relativity can only increase believers' awe as they learn and then constantly repeat that, in Einstein's general relativity, the speed of light is constant and the wavelength stretches or shrinks accordingly: http://www.astronomynotes.com/relativity/s4.htm "Prediction: light escaping from a large mass should lose energy---the wavelength must increase since the speed of light is constant." http://helios.gsfc.nasa.gov/qa_sp_gr.html "Is light affected by gravity? If so, how can the speed of light be constant? Wouldn't the light coming off of the Sun be slower than the light we make here? If not, why doesn't light escape a black hole? Yes, light is affected by gravity, but not in its speed. General Relativity (our best guess as to how the Universe works) gives two effects of gravity on light. It can bend light (which includes effects such as gravitational lensing), and it can change the energy of light. But it changes the energy by shifting the frequency of the light (gravitational redshift) not by changing light speed. Gravity bends light by warping space so that what the light beam sees as "straight" is not straight to an outside observer. The speed of light is still constant." Dr. Eric Christian http://math.ucr.edu/home/baez/physic..._of_light.html Steve Carlip: "Einstein went on to discover a more general theory of relativity which explained gravity in terms of curved spacetime, and he talked about the speed of light changing in this new theory. In the 1920 book "Relativity: the special and general theory" he wrote: ". . . according to the general theory of relativity, the law of the constancy of the velocity of light in vacuo, which constitutes one of the two fundamental assumptions in the special theory of relativity [. . .] cannot claim any unlimited validity. A curvature of rays of light can only take place when the velocity of propagation of light varies with position." Since Einstein talks of velocity (a vector quantity: speed with direction) rather than speed alone, it is not clear that he meant the speed will change, but the reference to special relativity suggests that he did mean so. THIS INTERPRETATION IS PERFECTLY VALID AND MAKES GOOD PHYSICAL SENSE, BUT A MORE MODERN INTERPRETATION IS THAT THE SPEED OF LIGHT IS CONSTANT in general relativity." http://www.sciamdigital.com/index.cf...4044CE9331CE46 "Almost all of our information about outer space comes in the form of light, and one of light's key features is that it gets redshifted - its electromagnetic waves get stretched - as it travels from distant galaxies through our ever expanding universe, in accordance with Albert Einstein's general theory of relativity." http://curious.astro.cornell.edu/que...php?number=278 "In both cases, the light emitted by one body and received by the other will be "redshifted" - i.e. its wavelength will be stretched, so the color of the light is more towards the red end of the spectrum. But there's a subtle difference, which you sort of allude to. In fact, only in the first case (a nearby body moving away from the earth) is the redshift caused by the Doppler effect. You've experienced the Doppler effect if you've ever had a train go past you and heard the whistle go to a lower pitch (corresponding to a longer wavelength for the sound wave) as the train moves away. The Doppler effect can happen for light waves too (though it can't be properly understood without knowing special relativity). It turns out that just like for sound waves, the wavelength of light emitted by an object that is moving away from you is longer when you measure it than it is when measured in the rest frame of the emitting object. In the case of distant objects where the expansion of the universe becomes an important factor, the redshift is referred to as the "cosmological redshift" and it is due to an entirely different effect. According to general relativity, the expansion of the universe does not consist of objects actually moving away from each other - rather, the space between these objects stretches. Any light moving through that space will also be stretched, and its wavelength will increase - i.e. be redshifted. (This is a special case of a more general phenomenon known as the "gravitational redshift" which describes how gravity's effect on spacetime changes the wavelength of light moving through that spacetime. The classic example of the gravitational redshift has been observed on the earth; if you shine a light up to a tower and measure its wavelength when it is received as compared to its wavelength when emitted, you find that the wavelength has increased, and this is due to the fact that the gravitational field of the earth is stronger the closer you get to its surface, causing time to pass slower - or, if you like, to be "stretched" - near the surface and thereby affecting the frequency and hence the wavelength of the light.) Practically speaking, the difference between the two (Doppler redshift and cosmological redshift) is this: in the case of a Doppler shift, the only thing that matters is the relative velocity of the emitting object when the light is emitted compared to that of the receiving object when the light is received. After the light is emitted, it doesn't matter what happens to the emitting object - it won't affect the wavelength of the light that is received. In the case of the cosmological redshift, however, the emitting object is expanding along with the rest of the universe, and if the rate of expansion changes between the time the light is emitted and the time it is received, that will affect the received wavelength. Basically, the cosmological redshift is a measure of the total "stretching" that the universe has undergone between the time the light was emitted and the time it was received." Pentcho Valev |
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Valev is running out of things to say?
On 30 Sep, 07:10, Pentcho Valev wrote:
Usual crap deleted Have you noticed that his repertoire of material is gradually shrinking but that certain paragraphs get repeated more and more often to an ever shrinking audience. |
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Valev is running out of things to say?
"Martin Nicholson" wrote in message ... On 30 Sep, 07:10, Pentcho Valev wrote: Usual crap deleted Have you noticed that his repertoire of material is gradually shrinking but that certain paragraphs get repeated more and more often to an ever shrinking audience. I quite often read his posts. They often contain interesting experimental evidence confirming Relativity, or some worthwhile ideas. The strange thing is that he posts all this material which supports Relativity, but seems to think it somehow disproves Relativity. I just ignore whatever bits he adds and read the quotes he provides. As I said, often worthwhile. |
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EINSTEINIANA: FUNDAMENTAL CAMOUFLAGE
Einsteinians love the analogy between light waves and sound waves when
the wave source is moving but the observer is not: http://www.amazon.com/Brief-History-.../dp/0553380168 Stephen Hawking: "In the 1920s, when astronomers began to look at the spectra of stars in other galaxies, they found something most peculiar: there were the same characteristic sets of missing colors as for stars in our own galaxy, but they were all shifted by the same relative amount toward the red end of the spectrum. To understand the implications of this, we must first understand the Doppler effect. As we have seen, visible light consists of fluctuations, or waves, in the electromagnetic field. The wavelength (or distance from one wave crest to the next) of light is extremely small, ranging from four to seven ten-millionths of a meter. The different wavelengths of light are what the human eye sees as different colors, with the longest wavelengths appearing at the red end of the spectrum and the shortest wavelengths at the blue end. Now imagine a source of light at a constant distance from us, such as a star, emitting waves of light at a constant wavelength. Obviously the wavelength of the waves we receive will be the same as the wavelength at which they are emitted (the gravitational field of the galaxy will not be large enough to have a significant effect). Suppose now that the source starts moving toward us. When the source emits the next wave crest it will be nearer to us, so the distance between wave crests will be smaller than when the star was stationary. This means that the wavelength of the waves we receive is shorter than when the star was stationary. Correspondingly, if the source is moving away from us, the wavelength of the waves we receive will be longer. In the case of light, therefore, means that stars moving away from us will have their spectra shifted toward the red end of the spectrum (red-shifted) and those moving toward us will have their spectra blue-shifted. This relationship between wavelength and speed, which is called the Doppler effect, is an everyday experience. Listen to a car passing on the road: as the car is approaching, its engine sounds at a higher pitch (corresponding to a shorter wavelength and higher frequency of sound waves), and when it passes and goes away, it sounds at a lower pitch. The behavior of light or radio waves is similar." Elsewhere Einsteinians would admit that the wavelength of sound waves remains constant as the observer changes his speed: http://ibphysicsstuff.wikidot.com/doppler-effect "In the case of the moving observer the wavelength of the sound does not change, but the frequency as measured by the observer does change. This happens because the observer encounters a wavefront more frequently." http://ruphe.fsac.ac.ma/cours/institut/coursins1.html "Supposons que l'observateur se déplace vers la source S à la vitesse Vo. La vitesse des ondes sonores par rapport à O est V'=V+Vo mais la longueur d'onde a sa valeur normale lambda=V/f." Yet crimestop always prevents Einsteinians from drawing the analogy between light waves and sound waves for the case of the moving observer: http://www.pitt.edu/~jdnorton/teachi...ang/index.html John Norton: "Here's a light wave and an observer. If the observer were to hurry towards the source of the light, the observer would now pass wavecrests more frequently than the resting observer. That would mean that moving observer would find the frequency of the light to have increased (AND CORRESPONDINGLY FOR THE WAVELENGTH - THE DISTANCE BETWEEN CRESTS - TO HAVE DECREASED)." http://www.liferesearchuniversal.com...html#seventeen George Orwell: "Crimestop means the faculty of stopping short, as though by instinct, at the threshold of any dangerous thought. It includes the power of not grasping analogies, of failing to perceive logical errors, of misunderstanding the simplest arguments if they are inimical to Ingsoc, and of being bored or repelled by any train of thought which is capable of leading in a heretical direction. Crimestop, in short, means protective stupidity." Pentcho Valev |
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EINSTEINIANA: FUNDAMENTAL CAMOUFLAGE
http://www.saburchill.com/physics/chapters2/0020.html
"If the observer moves with a velocity of magnitude vo (relative to the air) then the velocity of the waves relative to the observer is (v ±vo). In this case the wavelength of the waves is unchanged." If it were not for crimestop, Einsteinians would consider an analogous scenario: If the observer moves with a velocity of magnitude vo (relative to the LIGHT SOURCE) then the velocity of the waves relative to the observer is (c±vo). In this case the wavelength of the waves is unchanged." This scenario is compatible with Newton's emission theory of light. The scenario compatible with Maxwell's theory is: If the speed of light waves relative to the observer is c and the observer starts moving with a velocity of magnitude vo (relative to his original frame) then the velocity of the waves relative to the observer becomes (c±vo). In this case the wavelength of the waves is unchanged: http://www.amazon.com/Brief-History-.../dp/0553380168 Stephen Hawking: "Maxwell's theory predicted that radio or light waves should travel at a certain fixed speed. But Newton's theory had got rid of the idea of absolute rest, so if light was supposed to travel at a fixed speed, one would have to say what that fixed speed was to be measured relative to. It was therefore suggested that there was a substance called the "ether" that was present everywhere, even in "empty" space. Light waves should travel through the ether as sound waves travel through air, and their speed should therefore be relative to the ether. Different observers, moving relative to the ether, would see light coming toward them at different speeds, but light's speed relative to the ether would remain fixed." http://www.solidarity-us.org/node/58 "Maxwell's theory of electricity and magnetism provides a successful framework with which to study light. In this theory light is an electromagnetic wave. Using Maxwell's equations one can compute the speed of light. One finds that the speed of light is 300,000,000 meters (186,000 miles) per second. The question arises: which inertial observer is this speed of light relative to? As in the previous paragraph, two inertial observers traveling relative to each other should observe DIFFERENT SPEEDS FOR THE SAME LIGHT WAVE." http://culturesciencesphysique.ens-l..._CSP_relat.xml Gabrielle Bonnet, École Normale Supérieure de Lyon: "Les équations de Maxwell font en particulier intervenir une constante, c, qui est la vitesse de la lumière dans le vide. Par un changement de référentiel classique, si c est la vitesse de la lumière dans le vide dans un premier référentiel, et si on se place désormais dans un nouveau référentiel en translation par rapport au premier à la vitesse constante v, la lumière devrait désormais aller à la vitesse c-v si elle se déplace dans la direction et le sens de v, et à la vitesse c+v si elle se déplace dans le sens contraire." Pentcho Valev wrote: Einsteinians love the analogy between light waves and sound waves when the wave source is moving but the observer is not: http://www.amazon.com/Brief-History-.../dp/0553380168 Stephen Hawking: "In the 1920s, when astronomers began to look at the spectra of stars in other galaxies, they found something most peculiar: there were the same characteristic sets of missing colors as for stars in our own galaxy, but they were all shifted by the same relative amount toward the red end of the spectrum. To understand the implications of this, we must first understand the Doppler effect. As we have seen, visible light consists of fluctuations, or waves, in the electromagnetic field. The wavelength (or distance from one wave crest to the next) of light is extremely small, ranging from four to seven ten-millionths of a meter. The different wavelengths of light are what the human eye sees as different colors, with the longest wavelengths appearing at the red end of the spectrum and the shortest wavelengths at the blue end. Now imagine a source of light at a constant distance from us, such as a star, emitting waves of light at a constant wavelength. Obviously the wavelength of the waves we receive will be the same as the wavelength at which they are emitted (the gravitational field of the galaxy will not be large enough to have a significant effect). Suppose now that the source starts moving toward us. When the source emits the next wave crest it will be nearer to us, so the distance between wave crests will be smaller than when the star was stationary. This means that the wavelength of the waves we receive is shorter than when the star was stationary. Correspondingly, if the source is moving away from us, the wavelength of the waves we receive will be longer. In the case of light, therefore, means that stars moving away from us will have their spectra shifted toward the red end of the spectrum (red-shifted) and those moving toward us will have their spectra blue-shifted. This relationship between wavelength and speed, which is called the Doppler effect, is an everyday experience. Listen to a car passing on the road: as the car is approaching, its engine sounds at a higher pitch (corresponding to a shorter wavelength and higher frequency of sound waves), and when it passes and goes away, it sounds at a lower pitch. The behavior of light or radio waves is similar." Elsewhere Einsteinians would admit that the wavelength of sound waves remains constant as the observer changes his speed: http://ibphysicsstuff.wikidot.com/doppler-effect "In the case of the moving observer the wavelength of the sound does not change, but the frequency as measured by the observer does change. This happens because the observer encounters a wavefront more frequently." http://ruphe.fsac.ac.ma/cours/institut/coursins1.html "Supposons que l'observateur se déplace vers la source S à la vitesse Vo. La vitesse des ondes sonores par rapport à O est V'=V+Vo mais la longueur d'onde a sa valeur normale lambda=V/f." Yet crimestop always prevents Einsteinians from drawing the analogy between light waves and sound waves for the case of the moving observer: http://www.pitt.edu/~jdnorton/teachi...ang/index.html John Norton: "Here's a light wave and an observer. If the observer were to hurry towards the source of the light, the observer would now pass wavecrests more frequently than the resting observer. That would mean that moving observer would find the frequency of the light to have increased (AND CORRESPONDINGLY FOR THE WAVELENGTH - THE DISTANCE BETWEEN CRESTS - TO HAVE DECREASED)." http://www.liferesearchuniversal.com...html#seventeen George Orwell: "Crimestop means the faculty of stopping short, as though by instinct, at the threshold of any dangerous thought. It includes the power of not grasping analogies, of failing to perceive logical errors, of misunderstanding the simplest arguments if they are inimical to Ingsoc, and of being bored or repelled by any train of thought which is capable of leading in a heretical direction. Crimestop, in short, means protective stupidity." Pentcho Valev |
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