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# Topic: Speed of light

 What is the Speed of Light The speed of light is normally rounded to 300 000 kilometers per second or 186 000 miles per second. The speed of light depends on the material that the light moves through - for example: light moves slower in water, glass and through the atmosphere than in a vacuum. Speed of light: Historical timeline of measuring the speed of light www.whatisthespeedoflight.org   (300 words)

 Speed of Light Encyclopedia Article @ LaunchBase.org (Launch Base)   (Site not responding. Last check: 2007-10-22) The slower speed of light in materials can cause refraction, as demonstrated by this prism (in the case of a prism splitting white light into a spectrum of colours, the refraction is known as dispersion). However, these jets are not actually moving at speeds in excess of the speed of light: the apparent superluminal motion is a projection effect caused by objects moving near the speed of light and at a small angle to the line of sight. The constant speed of light is one of the fundamental Postulates (together with causality and the equivalence of inertial frames) of special relativity. www.launchbase.org /encyclopedia/Speed_of_light   (4292 words)

 [No title]   (Site not responding. Last check: 2007-10-22) Since the speed of light in vacuum is constant, it is convenient to measure both time and distance in terms of. On the microscopic scale this is caused by continual absorption and re-emission of the photons that compose the light by the atoms or molecules through which it is passing. The speed of light was first measured in 1676, some decades after Galileo's attempt, by Rømer, who was studying the motions of Jupiter's moonss. wikiwhat.com /encyclopedia/s/sp/speed_of_light.html   (1070 words)

 Speed of light - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-22) Note that this speed is a definition, not a measurement, in that the fundamental SI unit of distance, the metre, is defined in terms of the speed of light: one metre is the distance light travels in a vacuum in 1/299,792,458 of a second. The speed of light through a transparent medium (that is, not in vacuum) is less than c; the ratio of c to this speed is called the refractive index of the medium. 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. www.knowledgehunter.info /wiki/Speed_of_light   (4539 words)

 Speed Of Light - Free English Encyclopedia from Turkcebilgi It is important to realise that the speed of light is not a andquot;speed limitandquot; in the conventional sense. As [[Maxwell's equations]] directly give a speed of light, it should be the same for every observerandamp;mdash;a consequence which sounded obviously wrong to the 19th century physicists, who assumed that the speed of light given by Maxwell's theory is valid relative to the luminiferous aether. In 1887, the physicists Albert Michelson and Edward Morley performed the influential [[Michelson-Morley experiment]] to measure the speed of light relative to the motion of the earth, the goal being to measure the velocity of the Earth through the andquot;luminiferous aetherandquot;, the medium that was then thought to be necessary for the transmission of light. www.turkcebilgi.com /ansiklopedi/english/Speed_of_light   (4582 words)

 Speed of Light! For example, an observer outside gravitational fields measures the speed of light locally (in his location) at 299792.458 km/s but when he looks towards a fl hole he sees the speed of light there to be as slow as a few km/s. Similarly, Moslems speed of light use the sidereal system (with respect to stars) in their proof: For the Earth-moon system to be outside gravitational fields then the distance to the sun has to increase. Speed of light you reach that galaxy today and look back at Earth, you would not see Earth as it is today; instead you would see Earth as it was 100 million years ago (you would see the dinosaurs). www.speed-light.info   (6713 words)

 The UnMuseum - Speed of Light When we flip on the light in a room there is no delay between when we first see the bulb start glowing and when light illuminates the far corners of the chamber. When astronauts were on the Moon it took over a second for the radio waves (which travel at the speed of light) carrying their voices to reach us. The distance light can travel in a year is called a "light year." The light year is one of the basic measures of distance for astronomy. unmuseum.mus.pa.us /speed.htm   (556 words)

 Speed of Light By multiplying the period with the speed of light (c), we can determine the wavelength of any wave. Well, the gray dot that moves a distance "d" has the same speed as the wave because it is carried along with the wave. The speed of the wave is equal to the wavelength times the frequency. www.colorado.edu /physics/2000/waves_particles/lightspeed-1.html   (415 words)

 Speed of Light. Is the speed of angels, which we intend to calculate and then compare to the known speed of light (no external forces, no acceleration, no deceleration). This is because the speed of light is a variable depending upon the reference frame of the observer. The angels were originally made of light, and the speed at which they commute to and from this Tablet turned out to be the known speed of light. www.speed-light.info /angels_speed_of_light.htm   (8193 words)

 Speed of Light and Theory of Relativity This is because the usual concept of speed is inconsistent with the invariance of c unless one redefines length and time units accordingly. To clarify the meaning of the invariance of the speed of light and the velocity dependence in the 'transformation' equation, consider first the propagation of a massive body e.g. Of course, for the addition of velocities of material objects, the speed of light is not relevant at all and velocities are added in the usual way, i.e. www.physicsmyths.org.uk /lightspeed.htm   (953 words)

 Speed of Light If the speed of the mirror, the angle of the bounce and the length of the tube are known, it is possible to calculate the speed of light. In years to come, these findings would be cited as one of the first proofs this mysterious ether did not exist, that the speed of light was a constant, and that classical physics was not enough to explain the physical universe. By knowing the distance the light had traveled, the speed of the mirror and the angle of the bounce, Michelson could calculate the speed of light. oisc.net /Speed_of_Light.htm   (1811 words)

 Speed the Light - National Youth Ministries The official 2006-07 theme for Speed the Light is “Sacrifice.” What a fitting missions theme. Speed the Light Day is officially the 3rd Sunday of October, but you can choose any day. The following resources are available to help you plan a significant and successful Speed the Light service. stl.ag.org   (282 words)

 lighttpd fly light Security, speed, compliance, and flexibility--all of these describe LightTPD which is rapidly redefining efficiency of a webserver; as it is designed and optimized for high performance environments. light footprint + httpd = LightTPD (pronounced lighty) Its high speed io-infrastructure allows them to scale several times better with the same hardware than with alternative webservers. www.lighttpd.net   (354 words)

 NOVA | Einstein's Big Idea | The Light Stuff | PBS When he started thinking more seriously about light, he questioned the thinking of his day—that it traveled through a medium dubbed "ether," and that its speed was determined by how fast its source moved through this mysterious substance. Einstein realized that the speed of light—about 186,000 miles per second—is constant whether it comes from a moving source such as a speeding car's headlights or an unmoving source such as a ceiling light. But here's the catch: The speed of light is constant only in a vacuum, a place where there's no matter, like the vast emptiness of space. www.pbs.org /wgbh/nova/einstein/hotsciencelight   (198 words)

 Encyclopedia of Laser Physics and Technology - velocity of light, speed of light Within the International System of Units (SI), the vacuum velocity of light has been defined to exactly match this value, which together with the definition of the second (via a hyperfine transition of cesium atoms) determines the length of a meter. In some situations, the phase velocity or even the group velocity of light can exceed the vacuum velocity of light (→ superluminal transmission), although this is not associated with a violation of causality. There are other situations, occurring in ultracold gases, where the group velocity of light at least within a narrow spectral region is enormously reduced (→ ultraslow light). www.rp-photonics.com /velocity_of_light.html   (307 words)

 Light the Torch - An Olympics and World Sporting Events Blog   (Site not responding. Last check: 2007-10-22) Reading about Ilona Elek and her remarkable journey in the Olympics prodded me to feature her here at Light the Torch. Their answers will be studied by the IOC in order to help the IOC Executive Board to select the cities that will become Candidate Cities and therefore move on to Phase II. And this development was a high point in an Olympics almost canceled thanks to controversies surrounding it. www.lightthetorch.net   (1636 words)

 Attack at the Speed of Light - Popular Science The smoke and stink and deafening crack of munitions would be replaced by invisible beams of focused light. More important, however, is the reemergence of two technologies of the Star Wars past—solid-state and free-electron lasers—in the energized, promise-filled labs of two former colleagues who thought their dreams of laser triumph had died years ago. And instead of shining in every part of the spectrum, laser light is all the same wavelength, which depends on the “gain medium”—the type of atoms—you use to generate the beam. www.popsci.com /popsci/aviationspace/a4ce42fd3f98a010vgnvcm1000004eecbccdrcrd.html   (1091 words)

 Light Speed What bothers them is that if light could travel forward in time it could depends in part on the speed of light being unbreachable. light and may not apply to other physical entities. www.electrogravityphysics.com /html/speed_of_light.html   (643 words)

 Light Speed Internet Associates Internet software development web database and IDX solutions Light Speed Internet Associates develops easily implemented Internet business models and packages tailored closely to the customer's needs. Light Speed recognized eight years ago that the current marketing model employed by many of our ISP competitors was breeding bad business where businesses were told they would reap the rewards of a vast fast moving marketplace online and sell millions! Light Speed's primary mission is to develop sites quickly, deploy and enhance based on site statistical data. www.ltspeed.com   (970 words)

 Speed of Light   (Site not responding. Last check: 2007-10-22) This speed was first measured 1n 1675 by Danish astronomer Olaus Roemer, using observations of the moons of Jupiter. In order to get a consistent picture from the measurements, he needed to account for the time it takes the light to get from Jupiter to Earth, which varies according to how far away Jupiter is away. (But this gives a pretty crude measurement of the speed of light, since the distance to Jupiter was not well known.) zebu.uoregon.edu /~soper/Light/speedoflight.html   (103 words)

 Light Speed Technologies | Home - Light Speed Technologies The speed of light is 299,792,458 m/s (meters per second - that is equal to 186,287.490 miles per second) Founded in 1989, Light Speed Technologies has been providing Canadians with mission critical custom software solutions for 13 years. On The Internet - Find out how Light Speed helped The Sudbury Wolves increase their website popularity by over 330% in one month. www.lightspeedtech.com   (243 words)

 Incompetence at the speed of light But as you look at yet another 27 "cc":ed messages you have no discernible interest in, I ask this question: how's that workin' for you? Information travels through the Internet, or the Ether or whatever it is, at just under the speed of light. Back in 1954 when the 4 minute mile was considered an impossible barrier, there was the feeling that the human body would never be able to withstand the pressures of that kind of speed, and that Roger Bannister was in grave danger of actually bursting into flame. www.management-issues.com /2006/11/8/opinion/incompetence-at-the-speed-of-light.asp   (941 words)

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