is: a law relating the intensity of electromagnetic radiation, or other wave, radiating from a point source to the inverse square of the distance from that source. [P5.7, P6.1]
is a consequence: of geometry and the conservation of energy. [P6.1]
is exemplified: by the intensity of a propagating spherical wave, such as a sound wave or a light wave. [P5.7, P6.1]
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