I write to you today to ask for your support in helping us keep moving forward. Atomic and molecular spectroscopies continue to be primary tools for probing the structure of matter, providing ultrasensitive tests of atomic and molecular models and contributing to studies of fundamental photochemical reactions. 10.4236/ijaa.2014.44057 At that level a quantum theory is needed to explain the characteristics of light and to explain the interactions of light with atoms and molecules. QED combines the ideas of classical electromagnetism, quantum mechanics, and the special theory of relativity. Through the sense of sight, light is a primary tool for perceiving the world and communicating within it. More detailed and technical presentations of these topics can be found in the articles optics, electromagnetic radiation, quantum mechanics, and quantum electrodynamics. Who was the first scientist to conduct a controlled nuclear chain reaction experiment? Save 50% off a Britannica Premium subscription and gain access to exclusive content. The analysis of the frequencies of light emitted and absorbed by atoms was a principal impetus for the development of quantum mechanics. Vol.9 No.7，June 15, 2018, DOI: We are bathed in yellow warmth every day and stave off the darkness with incandescent and fluorescent bulbs.But what exactly is light? The spectral regions adjacent to the visible band are often referred to as light also, infrared at the one end and ultraviolet at the other. Euclid (c. 300 bce), in his Optics, presented a law of reflection and discussed the propagation of light rays in straight lines. When white light is spread apart by a prism or a diffraction grating, the colours of the visible spectrum appear. Vol.2 No.3，April 12, 2010, DOI: Pythagoras (c. 500 bce) proposed that sight is caused by visual rays emanating from the eye and striking objects, whereas Empedocles (c. 450 bce) seems to have developed a model of vision in which light was emitted both by objects and the eye. Please select which sections you would like to print: Corrections? 10.4236/as.2014.54028 10.4236/jbcpr.2014.22011 Psychology of Light: How Light Influences the Health and Psyche. 6,169 Downloads 8,419 Views Citations, International Journal of Astronomy and Astrophysics Light from the Sun warms the Earth, drives global weather patterns, and initiates the life-sustaining process of photosynthesis. 2,948 Downloads 4,513 Views Citations, Simulation Study of Heliostat-Based Daylighting System for Multi-Story Buildings (Articles), Journal of Power and Energy Engineering With the decline of the Greco-Roman realm, scientific progress shifted to the Islamic world. Indeed, light provides a window on the universe, from cosmological to atomic scales. Premium Membership is now 50% off! Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 × 10−11 metre to radio waves measured in metres. Where does light come from? Vol.4 No.3，March 14, 2013, DOI: 10.4236/ojoph.2015.52013 Among the initial scholars were al-Khwārizmī and al-Kindī. By interpreting that radiation, astronomers can glimpse the earliest epochs of the universe, measure the general expansion of the universe, and determine the chemical composition of stars and the interstellar medium. An Academic Publisher, Psychology of Light: How Light Influences the Health and Psyche (Articles), Rosella Tomassoni, Giuseppe Galetta, Eugenia Treglia, DOI: This article focuses on the physical characteristics of light and the theoretical models that describe the nature of light. In most everyday circumstances, the properties of light can be derived from the theory of classical electromagnetism, in which light is described as coupled electric and magnetic fields propagating through space as a traveling wave. A peculiar aspect of Joan Didion’s nonfiction is that a significant portion of it reads like fiction. Is light a wave or a particle? 10.4236/jamp.2020.88125 Epicurus (c. 300 bce) believed that light is emitted by sources other than the eye and that vision is produced when light reflects off objects and enters the eye. Black Friday Sale! Vol.2 No.3，July 26, 2012, DOI: Ibn al-Haytham’s work was translated into Latin in the 13th century and was a motivating influence on the Franciscan friar and natural philosopher Roger Bacon. English Franciscan philosopher and educational reformer Roger Bacon shown in his observatory at the Franciscan monastery, Oxford, England (engraving c. 1867). 10.4236/jamp.2017.53063 470 Downloads 843 Views Citations, A Scheduling Strategy of Light Supplement in Agricultural Greenhouse Based on the Displacement of Light Source Group (Articles), Journal of Applied Mathematics and Physics However, neither a classical wave model nor a classical particle model correctly describes light; light has a dual nature that is revealed only in quantum mechanics. Updates? 4,021 Downloads 6,820 Views Citations, Control of light environment: A key technique for high-yield and high-quality vegetable production in protected farmland (Articles), Xiaoyu Yang, Xiufeng Wang, Lijuan Wang, Min Wei, Agricultural Sciences While there is clear evidence that simple optical instruments such as plane and curved mirrors and convex lenses were used by a number of early civilizations, ancient Greek philosophers are generally credited with the first formal speculations about the nature of light. Bacon studied the propagation of light through simple lenses and is credited as one of the first to have described the use of lenses to correct vision. Vol.2 No.3，September 18, 2012, DOI: Scientific Research Electromagnetic waves and the electromagnetic spectrum, NeoK12 - Educational Videos and Games for School Kids - Light and Optics, light - Children's Encyclopedia (Ages 8-11), light - Student Encyclopedia (Ages 11 and up). 10.4236/opj.2011.13021 Just as the invention of the telescope dramatically broadened exploration of the universe, so too the invention of the microscope opened the intricate world of the cell. Vol.7 No.4，April 28, 2017, DOI: Based on what’s unfolding on the world stage, a few sources say that NESARA is closer than ever, but it has become difficult to know the stages of such events for certain. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. In most everyday circumstances, the properties of light can … Or, more specifically, it has the metaphorical power of great fiction. Hi, Kejraj here. 10.4236/ajps.2018.97102 Some of it, such as white light from stars, is visible light made up of the individual colors of the rainbow — such as when light passes through a prism. Vol.3 No.4，April 15, 2015, DOI: 10.4236/opj.2016.68B039 10.4236/ojopm.2012.23007 Technological applications based on the manipulations of light include lasers, holography, and fibre-optic telecommunications systems. 3,883 Downloads 4,312 Views Citations, The Impact of the Earth’s Movement through the Space on Measuring the Velocity of Light (Part Two) (Articles), Journal of Applied Mathematics and Physics 10.4236/psych.2015.610119 Light, electromagnetic radiation that can be detected by the human eye. ‘The Light Ages’ Review: Astronomy in the Abbey A 14th-century scholar’s ingenuity sought a new way to map the heavens. The speed of light in a vacuum is a fundamental physical constant, the currently accepted value of which is exactly 299,792,458 metres per second, or about 186,282 miles per second.
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