Light Wiki - What is the light?
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is the visible spectrum that is visible to the human eye and is responsible for the sense of sight. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This wavelength means a frequency range of roughly 430–750 terahertz (THz). The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence. For example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey. The primary properties of visible light are intensity, propagation direction, frequency or wavelength spectrum, and polarization, while its speed in a vacuum, 299,792,458 metres per second, is one of the fundamental constants of nature. Visible light, as with all types of electromagnetic radiation (EMR), is experimentally found to always move at this speed in a vacuum.In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. Like all types of EM radiation, visible light propagates as waves. However, the energy imparted by the waves is absorbed at single locations the way particles are absorbed. The absorbed energy of the EM waves is called a photon, and represents the quanta of light. When a wave of light is transformed and absorbed as a photon, the energy of the wave instantly collapses to a single location, and this location is where the photon "arrives." This is what is called the wave function collapse. This dual wave-like and particle-like nature of light is known as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics..
What does the word light mean? Find synonyms, antonyms and the meaning of the word light in our free online dictionary! Find words starting with light and anagrams of light.
Definitions of "light"
- Physics Electromagnetic radiation that has a wavelength in the range from about 4,000 (violet) to about 7,700 (red) angstroms and may be perceived by the normal unaided human eye. noun
- Physics Electromagnetic radiation of any wavelength. noun
- The sensation of perceiving light; brightness: a sudden light that made me blink. noun
- A source of light, especially a lamp, a lantern, or an electric lighting fixture: Turn out the lights when you leave. noun
- The illumination derived from a source of light: by the light of the moon. noun
- The particular quantity or quality of such illumination: moved the lamp closer to get better light. noun
- The pathway or route of such illumination to a person: You're standing in his light. noun
- A mechanical device that uses illumination as a signal or warning, especially a beacon or traffic signal. noun
- Daylight. noun
- Dawn; daybreak. noun
- Something, such as a window, that admits illumination. noun
- Architecture One of two or more openings in a window divided by a mullion or mullions. noun
- A source of fire, such as a match or cigarette lighter. noun
- Spiritual awareness; illumination. noun
- Something that provides information or clarification: threw some light on the question. noun
- A state of awareness or understanding, especially as derived from a particular source: in the light of experience. noun
- Public attention; general knowledge: brought the scandal to light. noun
- A way of looking at or considering a matter; an aspect: saw the situation in a different light. noun
- Archaic Eyesight. noun
The word "light" in example sentences
A change in the direction of a small portion of the sun's light passing by the solid body of the moon, it being deflected outward by repulsion or reflection from its surface, and other portions being deflected inward after passing the body by mutual repulsion of its own elements toward a _light vacuum_ or space devoid of the element of vibration.. [Scientific American Supplement, No. 441, June 14, 1884.]
We also hold these lights in our hands to honor Christ, and to acknowledge him as the _true light_, [5] whom they represent under this character, and who is called by holy Simeon in this mystery, _a light for the enlightening of the. [The Lives of the Fathers, Martyrs, and Principal Saints January, February, March]
_Delight_ is naturally formed by the participle _de_ and _light_, to make light, in the same way as "debase," to make base, "defile," to make foul.. [Notes and Queries, Number 38, July 20, 1850]
A correspondent of Mr. Knight's suggests {114} for the word _delight_ in this passage, also, a new derivation; using _de_ as a negation, and _light (lux), delighted_, removed from the regions of light.. [Notes and Queries, Number 38, July 20, 1850]
They report: 'Instead of the gas giving increased light as the rate of consumption is increased, it will be seen that _in every case_ there is a point beyond which the _light decreases_ relatively to the proportion of gas consumed.. [Lippincott's Magazine of Popular Literature and Science, Vol. XVI., December, 1880.]
It may be that the mental side is weak; that it is lazy and does not want to think; that the only food it craves is the sensational, and light, _very light_ reading and not much of that.. [The Girl and Her Religion]
This is sometimes used as a source of light, under the name of _Drummond_ or _lime light_.. [An Elementary Study of Chemistry]
"Variable as the shade, by the light quivering aspen made"; but variable as the _light_, manifold in fair and serene division, that it may take the color of all that it falls upon, and exalt it.. [Harvard Classics Volume 28 Essays English and American]
This effect of great light, is an almost invariable accompaniment of supra-consciousness, although there are instances of undoubted cosmic consciousness in which the realization has been a more gradual growth, rather than a sudden influx, in which the phenomenon of _light_ is not greatly marked.. [Cosmic Consciousness]
Christ Himself is called "the light of the world," and that He once made the very significant remark: "If thine eye be single, _thy whole body shall be full of light_.". [The Problems of Psychical Research Experiments and Theories in the Realm of the Supernormal]
In this conflict of light against darkness I do battle for the right, but I sometimes imagine that I have gone over to the enemy, that I am a vile deserter; and I hear a voice from Patmos saying, And men loved darkness rather than light; and then I am filled with terror, and I look upon myself as lost.. [May 19th. Part I.—Letters from My Nephew]
It is only when they preach or teach these preliminaries, these accessories, to be more important than Literature itselfit is only when they, owing all their excuse in life to the established daylight, din upon us that the precedent darkness claims precedence in honour, that one is driven to utter upon them this dialogue, in monosyllables: And God said, Let there be light: and there was light.. [XI. English Literature in Our Universities (II)]
The opposite party, however, did their utmost to darken the light; for they maintained that _shade is a part of light_.. [The German Classics of the Nineteenth and Twentieth Centuries, Volume 02 Masterpieces of German Literature Translated into English. in Twenty Volumes]
God is He who dwelleth in a light that is unapproachable, whom no man hath seen or can see: it is the _light_ of the knowledge of the _glory_ of God that He gives into our hearts.. [Holy in Christ Thoughts on the Calling of God's Children to be Holy as He is Holy]
If then we can only make this light _available_, it is clear that we shall have acquired a large increase of _light_ from the distant object.. [Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction.]
Those who are walking in the light can see what sort of requests to put up, when to put them up, and how to put them up; they see it all, because they are _in the light_.. [Godliness : being reports of a series of addresses delivered at James's Hall, London, W. during 1881]
Light Translates
Light English to Turkish Translatef. (-ed veya -lit) konmak; üzerine düşmek; inmek (at veya arabadan). light into azarlamak. light on rastgelmek, rastlamak. light out aceleyle yola çıkmak, yola düzülmek.f. (-ed veya -lit) konmak; üzerine düşmek; inmek (at veya arabadan). light into azarlamak. light on rastgelmek, rastlamak. light out aceleyle yola çıkmak, yola düzülmek.
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