In the 19th century most physicists accepted the old idea that all of space is filled with an elusive substance called the “luminiferous ether”. It was well known that. You were a sensical theory, luminiferous ether. And physicists love when things make sense. But science need not make sense—the universe. The theory of relativity is incorrect and the existence of a luminiferous ether as a propagation medium and an absolute frame of reference is.
|Published (Last):||22 June 2010|
|PDF File Size:||10.81 Mb|
|ePub File Size:||12.88 Mb|
|Price:||Free* [*Free Regsitration Required]|
Understanding the Social Significance of Scientific Discovery.
Please note that our editors may make some formatting changes or correct spelling or grammatical errors, and may also contact you if any clarifications are needed. Young believed that luminiferlus passed freely through the ether without in anyway disturbing it.
By measuring luminfierous angles the distance to the star can be calculated based on the known orbital circumference of the Earth around the sun. The E waves consist of ethfr dipolar electric fields, and all such dipoles appeared to require separated and opposite electric charges. From the present experiment we similarly infer that the frequency of light varies conformably to the theory.
Mathematics, Physics and PhilosophyDordrecht: As the Earth moves around the sun, the apparent angle to a given distant spot changes. As this can only occur in one reference frame in Newtonian physics see Galilean-Newtonian relativitythe aether was hypothesized as the absolute and unique frame of reference in which Maxwell’s equations hold.
And within the electromagnetic theory of Maxwell and Lorentz one can speak of the “Aether of Electrodynamics”, in which the aether possesses an absolute state of motion. Furthermore, Oliver Lodge’s experiments failed to detect any ether-drag near rapidly moving disks.
His life and Universe.
The electromagnetic wave and field concept history of science In history of science: In Fresnel introduced his hypothesis of partial ether drag, which reconciled Young’s position with Arago’s result. I’m just showing you even one example of light behaving like a wave. Retrieved 30 April He found that the Lorentz transformation must transcend its connection with Maxwell’s equations, and must represent the fundamental relations between the space and time coordinates of inertial frames of reference.
University of Texas Press, Many experimenters have claimed positive results.
Light and the luminiferous ether (video) | Khan Academy
Ether theories were also used to explain gravity beginning in the 17th century, but they did not have the popularity of those explaining the propagation of light. But the same was not supposed to be true for light, since Maxwell’s mathematics demanded a single universal speed for lumibiferous propagation of light, based, not on local conditions, but on two measured properties, the permittivity and permeability of free space, that were assumed to be the same throughout the universe.
It was impossible to visualize ether because contradictory properties had to be attributed to it in order to explain the phenomena known at any given time. What’s it going through? It traveled outwards from the point of that initial disturbance. It also had to be massless luminiferoous without viscosityotherwise it would visibly affect the orbits of planets. So there must be medium that it is traveling through. That disturbance kept traveling through the medium.
Fitzgeraldthe contraction hypothesis states that as an interferometer moves through the ether its arms shrink in the direction of motion by just the amount necessary to cause a null-result. That is the notion ethwr light. Though the null-result puzzled ether theorists, there was no sense of crisis luminifetous the physics community.
So, now that we’ve seen some classical notions of waves, let’s think about something a little bit more mysterious. Luminiferous aether or ether   “luminiferous”, meaning “light-bearing”was the postulated medium lminiferous the propagation of light. Using an extremely sensitive optical instrument—the interferometer—they attempted to measure Earth’s velocity with respect to the luminiferous ethsr, a hypothetical substance that most nineteenth-century physicists believed necessary for the propagation of light.
Physics > General Physics
This result was later on used by Einstein to refute the existence of the ether and allowed him to develop special relativity without this artificial and non-existent constraint. This medium was called the luminiferous light bearing ether. Attempts to measure an ether-drift continued into the late s and beyond, always with null-results.
Then you have this traveling lump. Once a concept is fixed in the mind, one often perceives confirmation of it elsewhere. The following year, Gustav Kirchhoff wrote a paper in which he showed that the speed of a signal along luminiefrous electric wire was equal to the speed of light. All the other “manifestations of the ether”, such as comet’s tails and the perihelion of Mercury, that had once seemed such persuasive evidence for the ether, were found to have other explanations.