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Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm), or perhaps 380–750 nm. In physics, the term light often refers to electromagnetic radiation of any wavelength, whether visible or not.

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Wikipedia About Light Source

PrismAndLight.jpg

Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm), or perhaps 380–750 nm. In physics, the term light often refers to electromagnetic radiation of any wavelength, whether visible or not.

Three primary properties of light are:

  • Intensity
  • Frequency or wavelength
  • Polarization

Light can exhibit properties of both waves and particles (photons). This property is referred to as wave–particle duality. The study of light, known as optics, is an important research area in modern physics.

Speed of light

main: Speed of light

The speed of light in a vacuum is presently defined to be exactly 299,792,458 m/s (about 186,282.397 miles per second). This definition of the speed of light means that the metre is now defined in terms of the speed of light. Light always travels at a constant speed, even between particles of a substance through which it is shining. Photons excite the adjoining particles that in turn transfer the energy to the neighbor. This may appear to slow the beam down through its trajectory in realtime. The time lost between entry and exit accounts to the displacement of energy through the substance between each particle that is excited.

Different physicists have attempted to measure the speed of light throughout history. Galileo attempted to measure the speed of light in the seventeenth century. An early experiment to measure the speed of light was conducted by Ole Rømer, a Danish physicist, in 1676. Using a telescope, Ole observed the motions of Jupiter and one of its moons, Io. Noting discrepancies in the apparent period of Io's orbit, Rømer calculated that light takes about 22 minutes to traverse the diameter of Earth's orbit. Unfortunately, its size was not known at that time. If Ole had known the diameter of the Earth's orbit, he would have calculated a speed of 227,000,000 m/s.

Another, more accurate, measurement of the speed of light was performed in Europe by Hippolyte Fizeau in 1849. Fizeau directed a beam of light at a mirror several kilometers away. A rotating cog wheel was placed in the path of the light beam as it traveled from the source, to the mirror and then returned to its origin. Fizeau found that at a certain rate of rotation, the beam would pass through one gap in the wheel on the way out and the next gap on the way back. Knowing the distance to the mirror, the number of teeth on the wheel, and the rate of rotation, Fizeau was able to calculate the speed of light as 313,000,000 m/s.

Léon Foucault used an experiment which used rotating mirrors to obtain a value of 298,000,000 m/s in 1862. Albert A. Michelson conducted experiments on the speed of light from 1877 until his death in 1931. He refined Foucault's methods in 1926 using improved rotating mirrors to measure the time it took light to make a round trip from Mt. Wilson to Mt. San Antonio in California. The precise measurements yielded a speed of 299,796,000 m/s.

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News about Light Source

Shifting Sound to Light May Lead to Better Computer Chips

Dr. Dobb's JournalBy reversing a process that converts electrical signals into sounds heard out of a cell phone, researchers may have a new tool to enhance the way computer chips, LEDs and transistors are built.http://www.ddj.com/hpc-high-performance-computing/216400221?...

UK: Watchdog forces C&C Group Magners Light advert change

Just DrinksC&C Group has been told to change its poster advert for Magners Light cider, after the UK Advertising Standards Authority ruled that it could mislead consumers.http://www.just-drinks.com/article.aspx?id=96765

New Revenue Source Rescues Pension Bill

WSAZ NewsChannel 3 West VirginiaVolunteer firefighters and ailing police and fire pension funds may still get help this legislative session.http://www.wsaz.com/home/headlines/41904327.html

AP source: Everglades land deal may be scaled back

Fort Worth Star-TelegramBy BRIAN SKOLOFF The tanking economy could force Florida to scale back its $1.34 billion deal to purchase land from U.S. Sugar Corp. to help restore the Everglades, a person close to the negotiations said Thursday. The state had been working to secure financing so it can buy the 180,000 acres of land in the Everglades from the nation's largest producer of cane sugar. But the state may now scale .....http://www.star-telegram.com/190/story/1280933.html

Mississippi makes red-light cameras illegal

Ars TechnicaThey may be advertised as speeding deterrents to city councils and safety tools to worried parents, but according to another school of thought, red-light cameras are all about making money. It's not clear whether the systems are always pitched as profit generators from day one or if the city government, confronted with a sudden jump in ticket revenue, makes its own decision to shorten yellow ...http://arstechnica.com/tech-policy/news/2009/03/mississippi-...

News about Light Source

Sudan says foreign airstrikes hit weapons convoy

Seattle TimesSudanese officials said foreign warplanes launched two separate airstrikes last month on Sudan near its border with Egypt, targeting convoys packed with light weapons and African migrants trying to sneak across the frontier. Just who was behind the ... http://seattletimes.nwsource.com/html/nationworld/2008928727...

Apple Files an Enterprise Quality Biometric Security System Patent for ...

MacNNThe sensor may include a light source operative to emit light, for example infrared light, to be reflected by the user’s eye and detected by a lens or optical sensor. The sensor may analyze the received light to create a representation of the user ... http://www.macnn.com/blogs/?p=694

Officer delayed Moats as relative died

ESPN.comAccording to Dallas-area media reports, Moats' vehicle, which rolled through a red light, was stopped by Officer Robert Powell in the hospital's parking lot. Powell kept Moats and another family member for 13 minutes, threatening Moats with arrest ... http://x.go.com/cgi/x.pl?goto=http://sports.espn.go.com/nfl/...

Global warming giving nuclear new sheen

AZCentral.comSome see nuclear as a stable, homegrown energy source in light of last year's oil price spikes. Others see it as a way to meet carbon-reduction goals. Public interest is emerging, too: A Gallup Poll released in recent days shows 59 percent favor the ... http://www.azcentral.com/business/consumer/articles/2009/03/...

Overnight crews work to return natural gas service

Atlanta Journal Constitution ... DeKalb County residents faced the prospect of chilly homes and cold showers into the evening Thursdayas Atlanta Gas Light Co ... It’s a very elaborate process, and usually take hours,” Gerke said. She did not know the source of the regulator problem.http://www.ajc.com/metro/content/metro/dekalb/stories/2009/0...

Search results for Light Source

The Light Source

Manufacturer of theatrical and television lighting equipment.http://www.thelightsource.com/

Canadian Light Source Inc.

A 3rd generation synchrotron in Saskatoon, Saskatchewan, Canada.http://www.lightsource.ca/

Light Source Solutions - Affordable Professional Software and ...

Joomla - the dynamic portal engine and content management systemhttp://www.lightsourcesolutions.co.uk/

Welcome to Lite Source - Your Source for Fashion-Forward Lighting

Search (Eg. LS-105BLK = 105) http://www.lite-source.com/

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Wikipedia results for Light Source

Light - Wikipedia, the free encyclopedia

A rotating cog wheel was placed in the path of the light beam as it traveled from the source, to the mirror and then returned to its origin. Fizeau found that at a certain rate of ... http://en.wikipedia.org/wiki/Light

Synchrotron light source - Wikipedia, the free encyclopedia

A synchrotron light source is a source of electromagnetic (EM) radiation produced by synchrotron radiation [1], which is artificially produced for scientific and technical purposes ... http://en.wikipedia.org/wiki/Synchrotron_light_source

Lighthouse - Wikipedia, the free encyclopedia

In classical period lighthouses, the light source was a kerosene lamp or earlier an animal or vegetable oil Argand lamp, and the lenses were rotated by a weight driven clockwork ... http://en.wikipedia.org/wiki/Lighthouse

Diamond Light Source - Wikipedia, the free encyclopedia

Diamond Light Source is a synchrotron research facility located in Oxfordshire, United Kingdom. It produced its first user beam towards the end of January 2007.http://en.wikipedia.org/wiki/Diamond_Light_Source

Advanced Light Source - Wikipedia, the free encyclopedia

The Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory in Berkeley, California is a synchrotron light source. Built from 1987 to 1993, it currently employs 185 ... http://en.wikipedia.org/wiki/Advanced_Light_Source
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Source Of Caylee Anthony's Legal Fund UnknownAn Orange County judge ruled Caylee won't have to disclose how she's paying for her high-powered defense team. Prosecutors had brought up the issue after they described Caylee...Windows Media - Video

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Council finds source of gas leak

Council finds source of gas leakMarch 9: At a city council meeting in Medina, Ohio, elected-officials convened a special session to find the source of an on-going gas leak, when one of the members had a hard...Windows Media - Video

US warns NKorea on missile

US warns NKorea on missileThe U.S. warned North Korea that launching a long-range missile would violate U.N. sanctions, while other nations called a test a security challenge.Flash - Video

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Answers for Light Source

Arch TeryxWhat would happen if a light source was lite in a mirrored sphere?Arch TeryxI've often wondered the same thing myself, actually. This is my theory, backed up by no one, so don't take my work implicitly. Assuming all the light waves came from a perfectly centralized poi...the_adbHow does the camera communicate with the light source inside a softbox, in a typical studio usage scenario ?the_adbGenerally it is wireless, though you could use a PC cord. Manufacturers like Pocket Wizards build a transmitter that will fit in the camera's hot shoe. You also get a PW receiver that is conn...PeachWhat kind of light source is best for light painting?PeachI use a SUREFIRE 6P or G2 which has a concentrated beam and kicks out 65 lumens. You can get lamps that will go higher but they also drain your batteries twice as fast. There are also other manufactu...MichelleWhat is it called when the plant is facing the light source?MichellePlants generally tend to bend toward the light source, and the shady part bends because of the uneven distribution of the growth hormone auxin. This phenomenon is called phototropismGustav FlatzDoes the distance from a light source affect the amount of oxygen that a plant produces?Gustav Flatzof course yes...because the distance has a invers proportionality with the quantity of light to the plant ;) consider u being at a distance of 100 m from school and at 10km from school (no cheating...
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