Tech/Inverse-square law: Difference between revisions

== Inverse-square law ==

[[File:Inverse_square_law.svg|right|200px]]

====Light and other electromagnetic radiation====

The intensity (or illuminance or irradiance) of light or other linear waves radiating from a point source (energy per unit of area perpendicular to the source) is inversely proportional to the square of the distance from the source, so an object (of the same size) twice as far away receives only one-quarter the energy (in the same time period).