inverse-square law


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inverse-square law

The intensity of radiation or light at any distance is inversely proportional to the square of the distance between the irradiated surface and a point source. Thus, a light with a certain intensity at a 4-ft distance will have only one-fourth that intensity at 8 ft and would be four times as intense at a 2-ft distance.
See also: law
Medical Dictionary, © 2009 Farlex and Partners

in·verse-square law

(in-vĕrs' skwār law)
A rule relating to radiation stating that intensity of radiation is inversely proportional to the square of the distance from radiation source to irradiated surface.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Testing the inverse-square law of gravity in boreholes at the Nevada Test Site.
The final measurement in this group of related experiments was a test of the inverse-square law of gravitation on the scale of meters to kilometers.
If there were two extra dimensions, however, each would have a scale of 0.1 to 1.0 mm--large enough to be detectable but small enough not to be ruled out by tests of the inverse-square law to date.
Testing the Inverse-Square Law of Gravity in Boreholes at the Nevada Test Site, Physical Review Letters, 1990, v.
Acknowledging that Newton had succeeded in solving the mathematical problem but incensed that his own name is not mentioned in a section of Newton's treatise recently read at a Royal Society meeting, Hooke has demanded that Newton give him proper credit in the Principia for the inverse-square law.
Test of the Gravitational Inverse-Square Law at Laboratory Distances.
Astronomer Stacy McGaugh (University of Maryland) puts it this way: "Suppose Newton, upon studying the solar system, would have formulated an inverse-cube law, claiming that the observed inverse-square law is the result of some mysterious, undetected dark matter.
In 1981 Israeli physicist Mordehai Milgrom conceived a way to avoid the need for dark matter: modify Newton's inverse-square law of gravity over very large distances.
Thus, the inverse-square law of gravitation is derived by methods of hydrodynamics based on a sink flow model of particles.
This result would disqualify proposed explanations such as dark matter in the solar system, the pull of Kuiper Belt objects, and alterations to Newton's inverse-square law over long distances, key to a theory known as Modified Newtonian Dynamics.