[doc30]

The emission of energy is filling a volume, but emissions originating at the same point in time radiate as a spherical front from a point source. The change in surface area of this expanding sphere is proportional to the square of the radius. It's basic geometry.

[jimt]

The emission of energy is filling a volume, but emissions originating at the same point in time radiate as a spherical front from a point source. The change in surface area of this expanding sphere is proportional to the square of the radius. It's basic geometry.

I understand the the way it is from even high school physics, and the geometry is indeed basic, but to me it still seems fundamentally odd that a force (gravitational or electromagnetic attraction) in a 3D space has a 2D mathematical solution.