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| | BIGpedia - Light - Encyclopedia and Dictionary Online |
 | | Atoms emit and absorb light at characteristic energies. | | | This is a light wave frozen in time and shows the two components of light; an electric field and a magnetic field that oscillate perpendicular to each other and to the direction of motion (a transverse wave). | | | Christian Huygens worked out his own wave theory of light in 1678, and published it in his Treatise on light in 1690. |
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http://www.bigpedia.com/encyclopedia/Light
(2512 words)
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| | Speed of Light Arrangement @ HigherPower.org (Higher Power) |
| | The result (analogous to a sonic boom) is known as Cherenkov radiation. | | | The first quantitative estimate of the speed of light was made in 1676 by Ole Rømer, who was studying the motions of Jupiter's satellite Io with a telescope. | | | This can cause distortion of electromagnetic waves that consist of multiple frequencies, called dispersion. |
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http://higherpower.org/encyclopedia/Speed_of_light
(3085 words)
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| | Encyclopedia4U - Light bulb - Encyclopedia Article |
| | Although it was an efficient design, the cost of the platinum made it impractical for commercial use. | | | However having perfected the device, to his own satisfaction, he turned to the problem of wireless telegrahy and did not develop the electric light any further. | | | The electric light bulb uses a glowing wire filament heated by electrical resistance to white heat to generate light (a process known as thermal radiation). |
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http://www.encyclopedia4u.com/l/light-bulb.html
(1399 words)
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| | Absorption of Light - encyclopedia article about Absorption of Light. |
| | This quantity is not absolute but relative to a state of the system known as its reference state or reference level. | | | Spectroscopy can be classified according to the physical quantity which is measured or calculated or the measurement process. | | | Molecules can lose absorbed energy by heat and radiation. |
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http://encyclopedia.thefreedictionary.com/Absorption+of+Light
(811 words)
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| | MedlinePlus Medical Encyclopedia: Vision - light sensitive |
| | The discomfort of light sensitivity can be reduced by avoiding sunlight, closing the eyes, wearing dark glasses, or darkening the room. | | | Sensitivity to light does not go away in a day or two. | | | Severe photophobia may be associated with eye problems and cause severe eye pain even in relatively low light. |
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http://www.nlm.nih.gov/medlineplus/ency/article/003041.htm
(496 words)
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