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ARTICLES RELATED TO speed of light | | | |  speed of light: Encyclopedia II - Speed of light - Physics
Speed of light - Constant velocity from all reference frames.
It is important to realise that the speed of light is not a "speed limit" in the conventional sense. An observer chasing a beam of light will measure it moving away from him at the same speed as a stationary observer. This leads to some unusual consequences for velocities.
Most individuals are accustomed to the addition rule of velocities: if two cars approach each other from opposite directions, each travelling at a speed of 50 kilometres per h ...
See also:Speed of light, Speed of light - Overview, Speed of light - Communications, Speed of light - Physics, Speed of light - Constant velocity from all reference frames, Speed of light - Interaction with transparent materials, Speed of light - Faster-than-light observations and experiments, Speed of light - Light-slowing experiments, Speed of light - History, Speed of light - Medieval and early modern theories, Speed of light - Measurement of the speed of light, Speed of light - Relativity Read more here: » Speed of light: Encyclopedia II - Speed of light - Physics |
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| | | | speed of light: Encyclopedia II - Speed of light - Overview
According to standard modern physical theory, all electromagnetic radiation, including visible light, propagates (or moves) at a constant speed in a vacuum, commonly known as the speed of light, which is a physical constant denoted as c. This speed c is also the speed of the propagation of gravity in the theory of general relativity.
One consequence of the laws of electromagnetism (such as Maxwell's equations) is that the speed c of electromagnetic radiation does not depend on the velocity of the object emitting t ...
See also:Speed of light, Speed of light - Overview, Speed of light - Communications, Speed of light - Physics, Speed of light - Constant velocity from all reference frames, Speed of light - Interaction with transparent materials, Speed of light - Faster-than-light observations and experiments, Speed of light - Light-slowing experiments, Speed of light - History, Speed of light - Medieval and early modern theories, Speed of light - Measurement of the speed of light, Speed of light - Relativity Read more here: » Speed of light: Encyclopedia II - Speed of light - Overview |
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| | | | speed of light: Encyclopedia II - Speed of light - History Until relatively recent times, the speed of light was largely a matter of conjecture. Empedocles maintained that light was something in motion, and therefore there had to be some time elapsed in travelling. Aristotle said that, on the contrary, "light is due to the presence of something, but it is not a movement". Furthermore, if light had a finite speed, it would have to be very great; Aristotle asserted "the strain upon our power ...
See also:Speed of light, Speed of light - Overview, Speed of light - Communications, Speed of light - Physics, Speed of light - Constant velocity from all reference frames, Speed of light - Interaction with transparent materials, Speed of light - Faster-than-light observations and experiments, Speed of light - Light-slowing experiments, Speed of light - History, Speed of light - Medieval and early modern theories, Speed of light - Measurement of the speed of light, Speed of light - Relativity Read more here: » Speed of light: Encyclopedia II - Speed of light - History |
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| | | | speed of light: Encyclopedia - Albert Abraham Michelson Albert Abraham Michelson, (pronunciation anglicized as "Michael-son", December 19, 1852 - May 9, 1931), was a Prussian-born American physicist known for his work on the measurement of the speed of light, and especially for the Michelson-Morley experiment. In 1907 he received a Nobel prize for physics, the first American to receive the Nobel Prize in the sciences.
Albert Abraham Michelson - Life.
Michelson was born in Strzelno, Poland (then Strelno, Provinz Posen Kingdom of Prussia) in 1852, the son of a Jew ...
Including:
Read more here: » Albert Abraham Michelson: Encyclopedia - Albert Abraham Michelson |
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| | | | speed of light: Encyclopedia II - Speed of light - Communications The speed of light is of relevance to communications. For example, given that the equatorial circumference of the Earth is 40,075 km and c, the theoretical shortest amount of time for a piece of information to travel half the globe is 0.067 second.
The actual transit time is longer, in part because the speed of light is slower by about 30% in an optical fibre and straight lines rarely occur in global communications situations, but also because delays are created when the signal passes thro ...
See also:Speed of light, Speed of light - Overview, Speed of light - Communications, Speed of light - Physics, Speed of light - Constant velocity from all reference frames, Speed of light - Interaction with transparent materials, Speed of light - Faster-than-light observations and experiments, Speed of light - Light-slowing experiments, Speed of light - History, Speed of light - Medieval and early modern theories, Speed of light - Measurement of the speed of light, Speed of light - Relativity Read more here: » Speed of light: Encyclopedia II - Speed of light - Communications |
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| | | | speed of light: Encyclopedia II - Light - Speed of light Although some people speak of the "velocity of light", the word velocity should be reserved for vector quantities, that is, those with both magnitude and direction. The speed of light is a scalar quantity, having only magnitude and no direction, and therefore speed is the correct term.
The speed of light has been measured many times, by many physicists. The best early measurement is Ole Rømer's (a Danish physicist), in 1676. By observing the motions of Jupiter and one of its moons, Io, with a telescope, and noting discr ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Speed of light |
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| | | | speed of light: Encyclopedia II - Refractive index - The speed of light The speed of all electromagnetic radiation in vacuum is the same, approximately 3×108 meters per second, and is denoted by c. Therefore, if v is the phase velocity of radiation of a specific frequency in a specific material, the refractive index is given by
This number is typically greater than one: the higher the index of the material, the more the light is slowed down. However, at certain frequencies (e.g. near absorption resonances, and for x-rays), n will actually be smaller th ...
See also:Refractive index, Refractive index - The speed of light, Refractive index - Dispersion and Absorption, Refractive index - Anisotropy, Refractive index - Nonlinearity, Refractive index - Inhomogeneity, Refractive index - Applications, Refractive index - External link Read more here: » Refractive index: Encyclopedia II - Refractive index - The speed of light |
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| | | | speed of light: Encyclopedia II - Albert Abraham Michelson - Speed of light
Albert Abraham Michelson - Early measurements.
As early as 1877, while still an officer in the US Navy, Michelson started planning a refinement of the rotating-mirror method of Léon Foucault for measuring the speed of light, using improved optics and a longer baseline. He conducted some preliminary measurements using largely improvised equipment in 1878 about which time his work came to the attention of Simon Newcomb, director of the Nautical Almanac Office who was already advanced in planning his own study. Mic ...
See also:Albert Abraham Michelson, Albert Abraham Michelson - Life, Albert Abraham Michelson - Speed of light, Albert Abraham Michelson - Early measurements, Albert Abraham Michelson - Mount Wilson and Lookout Mountain 1926, Albert Abraham Michelson - Michelson Pease & Pearson 1932, Albert Abraham Michelson - Interferometry, Albert Abraham Michelson - Astronomical interferometry, Albert Abraham Michelson - Reference in Bonanza television series, Albert Abraham Michelson - Electronic books Read more here: » Albert Abraham Michelson: Encyclopedia II - Albert Abraham Michelson - Speed of light |
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| | | | speed of light: Encyclopedia II - Variable speed of light - Implications of variations in c In relativity, c defines the relationship between metres and seconds, so every measurement that contains units of metres or seconds has the possibility of being affected. Planck units shows the interconnectedness of units and constants. If c changes (outside of the already known variations allowed in quantum theory), then there would be at least a few profound changes to other constants, equations, or ideas. Here are some possibilites:
the energy and/or mass of all particles would have to change: See also:Variable speed of light, Variable speed of light - Possibility of variations in c, Variable speed of light - Detecting variations in c, Variable speed of light - Implications of variations in c, Variable speed of light - History and current research, Variable speed of light - Experiments that modify c, Variable speed of light - Varying c in quantum theory Read more here: » Variable speed of light: Encyclopedia II - Variable speed of light - Implications of variations in c |
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| | | | speed of light: Encyclopedia II - Light - Theories about light
Light - Early Greek ideas.
In 55 BC Lucretius, continuing the ideas of earlier atomists, wrote that light and heat from the Sun were composed of minute particles.
Ptolemy also wrote about the refraction of light.
Light - 10th century optical theory.
The scientist Abu Ali al-Hasan ibn al-Haytham (965-c.1040), also known as Alhazen, developed a broad theory that explained vision, using geometry and anatomy, which stated that each point on an illuminated area or object radi ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Theories about light |
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| | | | speed of light: Encyclopedia II - Light - Theories about light
Light - Early Greek ideas.
In 55 BC Lucretius, continuing the ideas of earlier atomists, wrote that light and heat from the Sun were composed of minute particles.
Ptolemy also wrote about the refraction of light.
Light - 10th century optical theory.
The Persian scientist Abu Ali al-Hasan ibn al-Haytham (965-c.1040), also known as Alhazen, developed a broad theory that explained vision, using geometry and anatomy, which stated that each point on an illuminated area or obj ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Theories about light |
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| | | | speed of light: Encyclopedia II - Light - Refraction All light propagates at a finite speed. Even moving observers always measure the same value of c, the speed of light in vacuum, as c = 299,792,458 metres per second (186,282.397 miles per second). When light passes through a transparent substance, such as air, water or glass, its speed is reduced, and it undergoes refraction. The reduction of the speed of light in a denser material can be indicated by the refractive index, n, which is defined a ...
See also:Light, Light - Visible electromagnetic radiation, Light - Speed of light, Light - Refraction, Light - Optics, Light - Color and wavelengths, Light - Measurement of light, Light - Light sources, Light - Theories about light, Light - Early Greek ideas, Light - 10th century optical theory, Light - The 'plenum', Light - Particle theory, Light - Wave theory, Light - Electromagnetic theory, Light - Particle theory revisited, Light - Quantum theory, Light - Wave-particle duality, Light - A light wave Read more here: » Light: Encyclopedia II - Light - Refraction |
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