# inverse-square law

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## in·verse-square law

(ĭn′vûrs-skwâr′)*n.*

The principle in physics that the effect of certain forces, such as light, sound, and gravity, on an object varies by the inverse square of the distance between the object and the source of the force. For example, an object placed three feet away from a light source will receive only one ninth (

^{1}/_{32}, the inverse of 3 squared) as much illumination as an object placed one foot from the light.## inverse-square law

A principle in physics dealing with forces that spread equally in all directions (such as sound, light, and gravity) and describing how the strength of these forces weakens over increasing distance. According to this principle, the effect of the force on an object changes by the inverse square of the distance between the object and the force's source. For example, an object placed three feet away from a light source will receive only one-ninth (1/3

^{2}, the inverse of 3 squared) as much illumination as an object placed one foot from the light.Want to thank TFD for its existence? Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content.

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