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Inverse-square law

In physics, an inverse-square law is a physical law stating that some quantity is inversely proportional to the square of the distance from a point. In particular, Note: For example, the power radiated from a point source, e.g., an omnidirectional isotropic antenna, or from any source at very large distances from the source compared to the size of the source, must spread itself over larger and larger spherical surfaces as the distance from the source increases. Diffuse and incoherent radiation are similarly affected. Source: from Federal Standard 1037C

See also telecommunications.