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inverse-square law The law that a field follows if its strength decreases with the square of the distance. Fields that follow the inverse square law rapidly decrease in strength as the distance increases, but never quite reach zero.
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inverse-square law - (n.) Any law describing a force or other phenomenon that decreases in strength as the square of the distance from some central reference point.
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inverse-square law(1) -- any law in which some property varies inversely as the square of the distance, d. Mathematically, as 1/d2. (2) the law stating that the apparent brightness of a body decreases inversely as the square of its distance.
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The inverse-square law is significant to the exploration of the universe, because it means that the concentration of electromagnetic radiation decreases very rapidly with increasing distance from the emitter.
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The " inverse-square law" is another method used to measure distances. Though its name may sound complex, it's really just a mathematical way of describing a very simple effect -- a light that is closer to you is brighter than a light far away.
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inverse-square law (NASA SP-7, 1965) A relation between physical quantities of the form: x proportional to ; where y is usually a distance; and x terms are of two kinds, forces and fluxes.
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* 1684 - Isaac Newton writes down his inverse-square Law of universal gravitation* 1758 - Rudjer Josip Boscovich developes his Theory of forces, where gravity can be repulsive on small distances.
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Nowadays students who derive Kepler's laws from the "inverse-square law" use differential calculus, a mathematical tool in whose creation Newton had a large share.
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All of the above methods rely on a straightforward application of the inverse-square law or the angular diameter- distance relation. There is also a range of techniques that use more involved or indirect combinations of observables. Some examples are: ...
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range attenuation In radar terminology, the decrease in power density ( flux density) caused by the divergence of the flux lines with distance, this decrease being in accordance with the inverse-square law.
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The analysis shows that an infrared pulse from a laser, whose light output is not bound by the inverse-square law of light emitted from a hot body like the Sun, ...
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Then, by the inverse-square law of light we know how far the star is from us. Thus, we can determine the distance to anything with a known luminosity.
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The distances were calculated using the inverse-square law of light along with the definition of magnitude. The activity may work better with light bulbs, which are omnidirectional light sources.
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In it, Kepler described the inverse-square law governing the intensity of light, reflection by flat and curved mirrors, and principles of pinhole cameras, ...
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 See also: Light, Distance, Time, Energy, Universe
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