Inverse square relationships
The inverse square law is ubiquitous throughout physics. It refers to the decreasing intensity of the effect of a point source of a spherically symmetrical three-dimensional field as the square of the distance from the source increases. If a is the measured quantity and x is the distance from the source: a\propto {1\over x^{2}} What makes a quantity inversely proportional to the square of the distance? Well, because...