
	Where results make sense

Topic: Light second

Related Topics

Conversion of units

In the News (Fri 25 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Lord Kelvin \| Wave Theory Of Light (Site not responding. Last check: 2007-10-14)
		The wave-length of light is the distance from crest to crest of the wave, or from hollow to hollow.
		Plane-polarised light is light with the vibrations all in a single plane, perpendicular to the plane through the ray which is technically called the "plane of polarisation." Circularly polarised light consists of undulations of luminiferous ether having a circular motion.
		Light is always polarised when it is reflected from a plate of unsilvered glass, or from water, at a certain definite angle of fifty-six degrees for glass, fifty-two degrees for water, the angle being reckoned in each case from a perpendicular to the surface.
	zapatopi.net /kelvin/papers/wave_theory_of_light.html (0 words)

	Light second - Wikipedia, the free encyclopedia
		A light second is a unit of length.
		The average distance from the Earth to the Moon is 1.282 light seconds.
		The average distance from the Earth to the Sun (or 1 astronomical unit) is 499.0 light seconds or 8.317 light minutes.
	en.wikipedia.org /wiki/Light_second (226 words)

	Light - MSN Encarta
		As discussed in the section on electromagnetic waves, the length of light waves is measured in meters, and the frequency of light waves is measured in hertz.
		When light is considered as a source of illumination for human eyes, its intensity, or brightness, is measured in units that are based on a modernized version of the perceived brightness of a candle.
		Instead, Einstein said the speed of light had to remain constant, and all the rest of physics had to be changed to be consistent with this fact.
	encarta.msn.com /encyclopedia_761579230_6/Light.html (0 words)

	Light and Atoms (Site not responding. Last check: 2007-10-14)
		Light is an electric and magnetic disturbance in space, a bit like ripples in a pond, or sound waves.
		The velocity (speed) of light in a vacuum is approximately 300,000 km/s.
		Because the speed of light is so fundamental we use the idea of a light-second or a light-year as a measure of distance.
	www.goshen.edu /nasc/NaSc200/Notes/Light/light.html (0 words)

	SPEED OF SOUND AND LIGHT YEAR DISTANCE \| MILES OR KILOMETRES PER HOUR CONVERSION TABLES \| SPEED ACE NELSON KRUSCHANDL.
		Since the speed of light in a material depends on the refractive index, and the refractive index depends on the frequency of the light, light at different frequencies travels at different speeds through the same material.
		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.
		Any slight change in speed of light along each arm of the interferometer (due to the fact that the apparatus was moving with the Earth through the proposed "aether") would change the amount of time that the beam spent in transit, which would then be observed as a change in the pattern of interference.
	www.speedace.info /speed_of_sound_and_light_year_distance.htm (0 words)

	Modern History Sourcebook: Sir WilliamThomson (Lord Kelvin): Wave Theory Of Light, 1884
		The wave - length of light is the distance from crest to crest of the wave, or from hollow to hollow.
		Plane - polarised light is light with the vibrations all in a single plane, perpendicular to the plane through the ray which is technically called the "plane of polarisation." Circularly polarised light consists of undulations of luminiferous ether having a circular motion.
		Light is always polarised when it is reflected from a plate of unsilvered glass, or from water, at a certain definite angle of fifty - six degrees for glass, fifty - two degrees for water, the angle being reckoned in each case from a perpendicular to the surface.
	www.fordham.edu /halsall/mod/1884kelvin-light.html (0 words)

	Speed of Light
		The light forming the image of the spoon is bent as it passes from the water (a medium of high density) to the air (a medium of comparatively low density).
		The second difference is that sound is composed of longitudinal waves (alternate compressions and expansions of matter) and light is composed of transverse waves in an electromagnetic field.
		Violet light is produced at the high-frequency end of the light spectrum, while red light is produced at the low-frequency end of the light spectrum.
	www.tpub.com /neets/book10/39h.htm (0 words)

	Howstuffworks "What is a light year?"
		That doesn't make much sense because "light year" contains the word "year," which is normally a unit of time.
		Light travels at 186,000 miles per second (300,000 kilometers per second).
		Therefore, a light second is 186,000 miles (300,000 kilometers).
	science.howstuffworks.com /question94.htm (0 words)

	Seeing The Light - Round Island Lighthouse (Site not responding. Last check: 2007-10-14)
		While the construction of the Old Mackinac Point Light in 1892 eased the situation, the Lighthouse Board requested funds from Congress to augment the Mackinac Light with a second light in the Straits to be located on a shoal off Round Island.
		Mounted on a shelf on the exterior of the second floor, compressed air was piped up to the second floor via iron pipes on the inside wall of the building.
		Thus, Round Island Light was deemed to be no longer necessary as a navigational aid, and was abandoned and left to the elements.
	www.terrypepper.com /lights/huron/roundisland/roundisland.htm (0 words)

	Scientists Bring Light to Full Stop, Hold It, Then Send It on Its Way (Site not responding. Last check: 2007-10-14)
		This impression, actually consisting of patterns in a property of the atoms called their spin, was a kind of record of the light's passing and was enough to allow the experimenters to revive or reconstitute the original beam.
		Both Dr. Hau's original experiments on slowing light, and the new ones on stopping it, rely on a complex phenomenon in certain gases called electromagnetically induced transparency, or E.I.T. This property allows certain gases, like rubidium, that are normally opaque to become transparent when specially treated.
		For example, rubidium would normally absorb the dark red laser light used by Dr. Walsworth and his colleagues, because rubidium atoms are easily excited by the frequency of that light.
	hackensackhigh.org /light.html (0 words)

	Society for Neuroscience \| Light Detection (Site not responding. Last check: 2007-10-14)
		Although rods and cones are the light detectors that help us visualize images, another set of detectors appears to form a second eye system that monitors levels of brightness in the environment and aids a variety of different brain functions, including the control of our daily sleep and waking rhythms.
		A group of recent studies, however, now indicates that while rods and cones are the light detectors that help people see objects, movements, patterns and locations, another set of detectors forms a second eye system that functions as a primitive light meter.
		Light, however, daily resets our clocks so that they run cycles to precisely match the 24-hour cycle of the sun.
	www.sfn.org /index.cfm?pagename=brainBriefings_lightDetection (0 words)

	Speed of Light (Site not responding. Last check: 2007-10-14)
		With mirrors, turbines, his interferometer and an arc light, he measured the speed of light to within two miles per second of its currently accepted speed.
		In the center of the shack was the interferometer, which Michelson sometimes called his "she devil." At the heart of the machine, a wheel covered with finely-honed mirrors spun at exactly 512 revolutions per second.
		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.
	www.salsburg.com /light.html (0 words)

	Why is the speed of light so high? (Site not responding. Last check: 2007-10-14)
		For example, if the second is kept as the basic unit of time, then the unit of length must be equal to exactly 299792458 metres.
		This unit is called the light-second because it is the distance travelled by light in one second.
		It is probably no accident that the second is about the average duration of a heart beat and the metre or yard is the distance of one human step.
	math.ucr.edu /home/baez/physics/Relativity/SpeedOfLight/fast_light.html (0 words)

	eSky: Light Year
		Because a light year is directly related to the time light takes to travel through space, it follows that we look out into the universe we also look back in time.
		That star was about 6,300 light years from Earth, meaning that the light from the explosion took 6,300 years to cross the intervening space, and finally reached us in the year AD 1054; that was the date Earthbound observers finally saw the explosion that created the Crab Nebula.
		Perhaps because of this, the term 'light year' is sometimes misused as a unit of time (in expressions like 'light years ago' or 'light years into the future').
	www.glyphweb.com /esky/concepts/lightyear.html (0 words)

	09.28.2004 - Researchers use semiconductors to set speed limit on light
		They have shown for the first time that the group velocity of light - the speed at which a laser pulse travels along a light wave - can be slowed to about 6 miles per second in semiconductors.
		While that speed is not exactly the pace of a turtle, it is 31,000 times slower than the 186,000 miles (or 300 million meters) per second that light normally clocks while traveling through a vacuum.
		All the "slow" and "fast" light experiments that have been conducted to date exploit the way light is absorbed and dispersed when it interacts with matter.
	www.berkeley.edu /news/media/releases/2004/09/28_light.shtml (0 words)

	fUSION Anomaly. Light
		The speed of light is normally about 186,000 miles per second, or fast enough to go around the world seven times in the wink of eye.
		It takes light one second to traverse 186,000 miles, and since these galaxies are trillions of miles away from us, we are observing these galaxies as they existed millions of years ago.
		networks, are built with light, of light, and for light, to hasten its spread around the world.
	fusionanomaly.net /light.html (0 words)

	Second Light Network for Older Women
		Second Light is an informal network for women poets, aged around 40 and upwards who are published/beginning to get published/serious about developing their work.
		There will be a Second Light Festival in central London on Friday November 24th and 25th which will include four workshops and the adjudication by Penelope Shuttle of this year's annual competition as well as the two book launches.
		Second Light is particularly interested in creating opportunities for publication.
	www.esch.dircon.co.uk /second/second.htm (0 words)

	How far ? How big ? How many ?
		Beyond the Sun and its planets we need a longer ruler, which is the distance light travels in one year.
		This is called a light year - it is 32 million times longer than a light second.
		One was confirmed by measuring the dimming the light of the parent star as the planet passed in front of the star.
	www.hartrao.ac.za /other/howfar/howfar.html (0 words)

	Brant Point Light History
		The second light, also made of wood, was destroyed in a storm in March 1774, which was described in a newspaper as the "most violent gust of wind that perhaps was ever known there." The storm, probably a tornado, also destroyed many buildings on the island.
		The light was extinguished during the War of 1812.
		Its white light was changed to red in 1933 to avoid confusion with house lights.
	www.lighthouse.cc /brant/history.html (0 words)

	HHMI News: Molecule Helps Pupils Respond to Light
		Researchers are reporting progress in understanding whether a second light-sensing pathway in mammals indeed contributes to the detection of ambient light for controlling body functions.
		In a normal animal, increasing the light intensity would progressively increase the constriction of the pupil, until it is no more than a pinhole, said Yau.
		Since the knockout mice still exhibited some pupillary light reflex, albeit diminished, Yau and his colleagues suspected that the melanopsin-dependent reflex might be complemented by the rods and cones, the photoreceptors for the conventional, image-forming visual pathway.
	www.hhmi.org /news/yau2.html (0 words)

	Boston Light History
		Because Boston Light was destroyed in the Revolution and rebuilt in 1783, the tower itself is the nation's second oldest.
		Boston was the maritime center of America in colonial days, and there were other lighted beacons in the area before the first Boston Light.
		In 1859 Boston Light was raised to its present height of 89 feet and a new lantern room was added along with a 12-sided second order Fresnel lens.
	www.lighthouse.cc /boston/history.html (0 words)

	Home (Site not responding. Last check: 2007-10-14)
		Sheldon's Horse received official recognition from the 106th United States Congress as the modern continuation of the original 2nd Continental Light Dragoons.
		Under Title 3, chapter 31, 3-10, Governor's Powers of the General Statutes of Connecticut, Sheldon's Horse is granted status as a reactivated "in service" military unit and serves on orders as a representative of the State of Connecticut.
		Note any use of the materials found on this site without written permission is subject to prosecution to the full extend of the law.
	www.dragoons.info (0 words)

	The Second Light ~ Articles (Site not responding. Last check: 2007-10-14)
		Her next attack I chose was "Needle Army." A series of hundreds of needles stab her enemy.
		You can see that I did not make Sailor Neith all powerful Her first attack would probably be used to aid the other senshi while her second can be used to harm an enemy.
		This is the one category most people seem to have trouble with and unfortunately it's one of the most important.
	secondlight.animehunters.com /extras_articles_katiejones.html (0 words)

	Team SECOND CHANCE'S Light the Night Page 2005
		The Light The Night Walk is The Leukemia & Lymphoma Society's nationwide evening walk to raise awareness and funds to cure leukemia, lymphoma and myeloma, and improve the quality of life of patients and their families.
		Please make a donation to support my participation in the Light The Night Walk.
		Click here to find out more information about Light the Night.
	www.active.com /donations/fundraise_public.cfm?key=ltnburks (0 words)

	Dynamics of Cats : ACS second first light (Site not responding. Last check: 2007-10-14)
		Dynamics of Cats : ACS second first light
		ACS first light images after the switch to the spare (side 2) electronics, after the failure of the side 1 power controller.
		Found a redshift =1.4 supernova (~ 9 billion light years away), as part of Perlmutter's (LBL) high redshift supernova search, which is looking for additional date on the accelerating expansion of the universe and hence further confirmation of and testing of Dark Energy
	scienceblogs.com /catdynamics/2006/07/acs_second_first_light.php (0 words)

	Inventory of Historic Light Stations--Virginia--Cape Henry Lights
		First Tower (above): NPS photo by Ralph Eshelman, 1995; Second Tower (at left): NPS photo by Candace Clifford, 1989
		YES (Go to Lighthouses to Visit for access information)
		FIRST LIGHT CONSTRUCTED BY U.S. Last Modified: Thu, Feb 10 2005 2:41:02 pm EDT
	www.cr.nps.gov /maritime/light/capehenr.htm (0 words)

Try your search on: Qwika (all wikis)