# inverse-square law

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## inverse-square law

[′in‚vərs ¦skwer ‚lȯ]
(physics)
Any law in which a physical quantity varies with distance from a source inversely as the square of that distance.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## inverse-square law inverse-square law
A law which applies to a light source (or to a sound source) that is in a space far away from any reflecting surface: the intensity at a point, as measured on a surface which is perpendicular to a line drawn between the point and the source, varies inversely with the square of the distance between the point and the source. (For sound waves, this decrease in intensity is equivalent to a drop in sound-pressure level of 6 dB for each doubling of distance from the source.)
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
SPL measurements were made only at distances of 1 m, 25 m, 50 m, and 100 m, which means that he curvature of the inverse square law was not well reproduced, but the general trend is clear.
These two classes of modalities are related by the inverse square law. Inverse square law states that as one moves away from the radioactive source, the amount of radiotherapy that can be measured is inversely proportional to the square of the distance.
But each has implemented the vertical motion differently, and this accounts for the different functional fall off of signal with distance in the two cases as well as their difference from the inverse square law. In each case, the solid curves are fits to the data points shown.
It is obvious by looking at the results of the sec- ond part that the distance obeys the inverse square law: the nitrous oxide concentration decreases as the distance from working site in- creases.
Despite their applicability in appropriate circumstances, both view factor and inverse square law methods have significant limitations, particularly when the geometry is complex.
In effect, the rate at which oil mass is lost from an ink decays according to an approximate inverse square law with time.
The inverse square law of the jammer-to-signal (J/S) equation is operative here, since the closer a jammer of a given power rating is to the target emitter, the better the J/S ratio.
It relieves them of the daunting burden of comparison with his achievements and it affirms the inverse square law between scientific genius and the capacity for love.
In his Principia, Newton posited that this theory actually contained the essence of the inverse square law of gravity; in other words, Pythagoras's theory just needed the proper Newtonian exegesis to reveal the hidden workings of the universe.
Newton then showed that if the trajectory of a planet moving under the influence of a central attractive force is an ellipse and the centre of attraction is one of its loci, then the law of force (relating the magnitude of the force to the distance from the centre) must be an inverse square law. Moreover, he proved that this conclusion also follows for elliptical orbits of different sizes about a common focus, given that the squares of the periodic times are as the cubes of the transverse diameters.
Since the apparent brightness of a star diminishes as the square of the distance -- the well-known inverse square law -- a nearby, modest star like Sirius can outshine a remote supergiant like Rigel.

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