WikiVisually
Infinite photos and videos for every Wiki article · Find something interesting to watch in seconds
World Banknotes Celebrities History by Country Ancient Marvels Tallest Buildings Famous Castles Sports Presidents Countries of the World British Monarchs Great Cities Wonders of Nature Wars and Battles Supercars Animals Rare Coins Crown Jewels Great Museums Largest Empires Great Artists Richest US Counties Orders and Medals Best Campuses Recovered Treasures Kings of France Largest Palaces
more top lists
History
Point source
Videos
Page
A point source is a single identifiable localised source of something. A point source has negligible extent, distinguishing it from other source geometries. Sources are called point sources because in mathematical modeling, these sources can usually be approximated as a mathematical point to simplify analysis.
Geiger-Müller counter with dual counts/dose rate display measuring a "point source".
Geiger-Müller counter with dual counts/dose rate display measuring a "point source".
A mushroom cloud as an example of a thermal plume. A nuclear explosion can be treated as a thermal point source in large-scale atmospheric simulations
A mushroom cloud as an example of a thermal plume. A nuclear explosion can be treated as a thermal point source in large-scale atmospheric simulations.
Inverse-square law
Videos
Page
In science, an 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. The fundamental cause for this can be understood as geometric dilution corresponding to point-source radiation into three-dimensional space.
German astronomer Johannes Kepler discussed the inverse-square law and how it affects the intensity of light.
German astronomer Johannes Kepler discussed the inverse-square law and how it affects the intensity of light.