Prab: CSV import

2025-03-23T10:48:39Z

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← Older revision		Revision as of 10:48, 23 March 2025
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	~~- characterized by or emitting light;~~ (~~used of color~~) ~~having~~ a ~~relatively small amount~~ of ~~coloring agent; (~~of ~~sleep) easily disturbed; demanding little effort; not burdensome; having relatively few calories; easily assimilated in~~ the ~~alimentary canal; not rich or heavily seasoned; of comparatively little physical weight or density; designed~~ for ~~ease~~ of ~~movement or to carry little weight; psychologically light; especially free from sadness or troubles; not great~~ in ~~degree or quantity or number;~~ (~~physics~~, ~~chemistry) not having atomic weight greater than average; of little intensity~~ or ~~power or force; moving easily and quickly; nimble; of~~ the ~~military or industry; using~~ (~~or being~~) ~~relatively small or light arms or equipment; intended primarily as entertainment; not serious or profound; having little importance; less than~~ the ~~correct or legal or full amount often deliberately so; casual and unrestrained in sexual behavior;~~ (~~used~~ of ~~soil) loose~~ and ~~large~~-~~grained~~ in ~~consistency; (of sound or color) free from anything that dulls or dims; silly or trivial; used of vowels or syllables; pronounced with little or no stress; marked~~ by ~~temperance in indulgence; very thin~~ and ~~insubstantial; weak and likely to lose consciousness; with few burdens; any device serving as a source~~ of ~~illumination; the visual effect~~ of ~~illumination on objects or scenes as created~~ in ~~pictures; public awareness; mental understanding as an enlightening experience; a particular perspective or aspect of~~ a ~~situation; a visual warning signal; an illuminated area; a person regarded very fondly;~~ (~~physics~~) electromagnetic ~~radiation that can produce a visual sensation; having abundant~~ light ~~or illumination; a condition of spiritual awareness; divine illumination; a device for lighting or igniting fuel or charges or fires; merriment expressed by~~ a ~~brightness or gleam or animation~~ of ~~countenance; the quality of being luminous; emitting or reflecting~~ light~~; a divine presence believed by Quakers to enlighten~~ and ~~guide the soul; make lighter or brighter; begin to smoke; get~~ off (a ~~horse); to come~~ to ~~rest~~, ~~settle; fall to somebody by assignment or lot; cause to start burning; subject to fire or great heat~~		{{short description\|Physical phenomenon of electromagnetic radiation}}
	~~{{stub}}~~
	~~{{pollution}}~~		[[File:Prism_flat_rainbow_(cropped).jpg\|thumb\|right\|A prism dispersing light into a spectrum of colors.]]
	[[~~Category:Pollution~~]]
	~~<gallery>~~		'''Light''' is a form of [[electromagnetic radiation]] that is visible to the human eye and is responsible for the sense of [[sight]]. It is a small part of the electromagnetic spectrum and is typically defined as having [[wavelength]]s in the range of 400–700 nanometers (nm), or 4.00 × 10<sup>−7</sup> to 7.00 × 10<sup>−7</sup> meters, between the [[infrared]] (with longer wavelengths) and the [[ultraviolet]] (with shorter wavelengths).
	File:~~Prism_flat_rainbow_(cropped)~~.jpg\|Light
	~~File:EM_spectrum~~.~~svg\|Light~~		==Properties of Light==
	File:Rocca_dell'Abisso,_Fondachelli_Fantina,_Sicilia.JPG\|~~Light~~		Light exhibits both [[wave]] and [[particle]] properties, a phenomenon known as [[wave-particle duality]]. This dual nature is a fundamental concept in [[quantum mechanics]].
	~~File:Linear_visible_spectrum~~.~~svg\|Light~~
	~~File:Optical_refraction_at_water_surface.jpg\|Light~~		===Wave Properties===
	File:Colorful_artificial_lighting_at_night.jpg\|~~Light~~		Light behaves as a wave, which can be described by its [[wavelength]], [[frequency]], and [[speed of light\|speed]]. The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s), and it is one of the fundamental constants of nature.
	~~File:PierreGassendi~~.~~jpg\|Light~~
	~~File:Christiaan_Huygens-painting.jpeg\|Light~~		[[File:EM_spectrum.svg\|thumb\|left\|The electromagnetic spectrum, with visible light highlighted.]]
	~~File:Young_Diffraction.png\|~~Light
	~~File:Onde_electromagnetique~~.~~svg\|Light~~		===Particle Properties===
	~~</gallery>~~		Light also behaves as a stream of particles called [[photon]]s. Photons are massless particles that carry energy and momentum, and their energy is proportional to the light's frequency.
	~~<gallery>~~
	~~File:Prism flat rainbow (cropped)~~.~~jpg\|Light~~		==Interaction with Matter==
	~~File:EM spectrum.svg\|Light~~		Light interacts with matter in various ways, including [[reflection]], [[refraction]], [[diffraction]], and [[absorption]].
	~~File:Rocca dell'Abisso~~, ~~Fondachelli Fantina, Sicilia~~.~~JPG\|Light~~
	~~File:Linear visible spectrum.svg\|Light~~		===Reflection===
	~~File:Optical refraction at water surface~~.~~jpg\|Light~~		Reflection occurs when light bounces off a surface. The angle of incidence is equal to the angle of reflection, a principle known as the [[law of reflection]].
	~~File:Colorful artificial lighting at night~~.~~jpg\|Light~~
	~~File:PierreGassendi.jpg\|Light~~		===Refraction===
	File:~~Christiaan Huygens~~-painting.jpeg\|~~Light~~		Refraction is the bending of light as it passes from one medium to another with a different [[refractive index]]. This phenomenon is responsible for the focusing of light by lenses and the formation of rainbows.
	~~File:Young Diffraction~~.~~png\|Light~~
	~~File~~:~~Onde electromagnetique.svg\|~~Light		[[File:Optical_refraction_at_water_surface.jpg\|thumb\|right\|Refraction of light at the surface of water.]]
	~~</gallery>~~
			===Diffraction===
			Diffraction is the bending of light around obstacles and the spreading of light waves when they pass through small openings. This effect is more pronounced when the size of the obstacle or opening is comparable to the wavelength of the light.

			===Absorption===
			Absorption occurs when light is absorbed by a material, converting the light energy into other forms, such as heat. Different materials absorb different wavelengths of light, which is why objects have different colors.

			==Sources of Light==
			Light can be produced by various sources, both natural and artificial.

			===Natural Sources===
			The primary natural source of light is the [[Sun]], which emits light through the process of [[nuclear fusion]]. Other natural sources include stars, [[bioluminescence]] in organisms, and [[lightning]].

			[[File:Rocca_dell'Abisso,_Fondachelli_Fantina,_Sicilia.JPG\|thumb\|left\|Natural light illuminating a landscape.]]

			===Artificial Sources===
			Artificial sources of light include [[incandescent light bulb\|incandescent bulbs]], [[fluorescent lamp\|fluorescent lamps]], [[LED]]s, and other forms of [[electric lighting]].

			[[File:Colorful_artificial_lighting_at_night.jpg\|thumb\|right\|Artificial lighting at night.]]

			==Historical Theories of Light==
			The nature of light has been a subject of study and debate for centuries.

			===Early Theories===
			In ancient times, philosophers like [[Empedocles]] and [[Euclid]] proposed theories about light and vision. Empedocles suggested that light was emitted from the eye, while Euclid believed in the rectilinear propagation of light.

			===Particle Theory===
			[[Isaac Newton]] proposed the particle theory of light, suggesting that light is composed of small particles. This theory explained reflection and refraction but struggled with diffraction and interference.

			===Wave Theory===
			[[Christiaan Huygens]] proposed the wave theory of light, which explained phenomena like diffraction and interference. Huygens' principle describes how wavefronts propagate through space.

			[[File:Christiaan_Huygens-painting.jpeg\|thumb\|left\|Christiaan Huygens, proponent of the wave theory of light.]]

			===Quantum Theory===
			In the 20th century, the development of quantum mechanics led to the understanding of light as having both wave and particle properties. [[Albert Einstein]]'s explanation of the [[photoelectric effect]] provided evidence for the particle nature of light.

			==Related Pages==
			* [[Electromagnetic spectrum]]
			* [[Photon]]
			* [[Optics]]
			* [[Quantum mechanics]]
			* [[Wave-particle duality]]

			[[Category:Light]]
			[[Category:Electromagnetic radiation]]

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2025-02-20T01:18:57Z

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 File:Young_Diffraction.png|Light
 File:Onde_electromagnetique.svg|Light
 </gallery>

Prab: CSV import

2025-02-18T12:08:49Z

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← Older revision		Revision as of 12:08, 18 February 2025
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	{{pollution}}		{{pollution}}
	[[Category:Pollution]]		[[Category:Pollution]]
			<gallery>
			File:Prism_flat_rainbow_(cropped).jpg\|Light
			File:EM_spectrum.svg\|Light
			File:Rocca_dell'Abisso,_Fondachelli_Fantina,_Sicilia.JPG\|Light
			File:Linear_visible_spectrum.svg\|Light
			File:Optical_refraction_at_water_surface.jpg\|Light
			File:Colorful_artificial_lighting_at_night.jpg\|Light
			File:PierreGassendi.jpg\|Light
			File:Christiaan_Huygens-painting.jpeg\|Light
			File:Young_Diffraction.png\|Light
			File:Onde_electromagnetique.svg\|Light
			</gallery>

Prab at 02:42, 2 October 2020

2020-10-02T02:42:24Z

New page

- characterized by or emitting light; (used of color) having a relatively small amount of coloring agent; (of sleep) easily disturbed; demanding little effort; not burdensome; having relatively few calories; easily assimilated in the alimentary canal; not rich or heavily seasoned; of comparatively little physical weight or density; designed for ease of movement or to carry little weight; psychologically light; especially free from sadness or troubles; not great in degree or quantity or number; (physics, chemistry) not having atomic weight greater than average; of little intensity or power or force; moving easily and quickly; nimble; of the military or industry; using (or being) relatively small or light arms or equipment; intended primarily as entertainment; not serious or profound; having little importance; less than the correct or legal or full amount often deliberately so; casual and unrestrained in sexual behavior; (used of soil) loose and large-grained in consistency; (of sound or color) free from anything that dulls or dims; silly or trivial; used of vowels or syllables; pronounced with little or no stress; marked by temperance in indulgence; very thin and insubstantial; weak and likely to lose consciousness; with few burdens; any device serving as a source of illumination; the visual effect of illumination on objects or scenes as created in pictures; public awareness; mental understanding as an enlightening experience; a particular perspective or aspect of a situation; a visual warning signal; an illuminated area; a person regarded very fondly; (physics) electromagnetic radiation that can produce a visual sensation; having abundant light or illumination; a condition of spiritual awareness; divine illumination; a device for lighting or igniting fuel or charges or fires; merriment expressed by a brightness or gleam or animation of countenance; the quality of being luminous; emitting or reflecting light; a divine presence believed by Quakers to enlighten and guide the soul; make lighter or brighter; begin to smoke; get off (a horse); to come to rest, settle; fall to somebody by assignment or lot; cause to start burning; subject to fire or great heat
{{stub}}
{{pollution}}
[[Category:Pollution]]

Light - Revision history

Prab: CSV import

Prab: CSV import

Prab: CSV import

Prab at 02:42, 2 October 2020