Tech/Inverse-square law: Difference between revisions
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== Inverse-square law == |
== Inverse-square law == |
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[[File:Inverse_square_law.svg|right|200px]] |
[[File:Inverse_square_law.svg|right|200px]] |
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Inverse-square law is any scientific law stating that the observed "intensity" of a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity. |
Inverse-square law is any scientific law stating that the observed "intensity" of a specified physical quantity is inversely proportional to the square of the distance from the source of that physical quantity. <ref name=SquareLawVideo></ref> |
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====Light and other electromagnetic radiation==== |
====Light and other electromagnetic radiation==== |
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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). |
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). |
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===References=== |
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<ref name="SquareLawVideo">[https://www.youtube.com/watch?v=FhTPAuK7LQo YouTube: The Square Law (a.k.a. The Inverse Square Law)]</ref> |
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