Changes

|pages=149

|pages=149

|isbn=978-0-85234-707-2

|isbn=978-0-85234-707-2

|url=http://books.google.com/books?id=p5LkPwAACAAJ&dq=Andrews+Who+made&hl=en&sa=X&ei=ahTXUYX9A4qF4gTLoYGgCQ&ved=0CCsQ6AEwAA

|url=https://books.google.com/books?id=p5LkPwAACAAJ&dq=Andrews+Who+made&hl=en&sa=X&ei=ahTXUYX9A4qF4gTLoYGgCQ&ved=0CCsQ6AEwAA

|quote= }}</ref>  

|quote= }}</ref>  

Take a [[point source]] that is propagating something ([[light]], [[sound]], [[gravity]], [[electric field]], etc..) out.   

Take a point source that is propagating something ([[light]], [[sound]], [[gravity]], [[electric field]], etc..) out.   

The inverse square law can be derived by looking at the surface area of a [[sphere]] of radius ''r''.  The surface area of a sphere is 4&pi;r².  As the radius increases, the surface area of the sphere goes up with the square of the radius and the intensity of the phenomena will be inversely proportional to the [[surface area]].   

The inverse square law can be derived by looking at the surface area of a [[sphere]] of radius <math>r</math>.  The surface area of a sphere is <math>4 \pi r^2</math> As the radius increases, the surface area of the sphere goes up with the square of the radius and the intensity of the phenomena will be inversely proportional to the [[surface area]].   

With gravity, the inverse square law can be seen in Gm₁m₂ / r².

With gravity, the inverse square law can be seen as:

 

<math>

F= \frac{Gm_1m_2}{r^2}

</math>

== Applications ==

== Applications ==

<references />

<references />

[[Category:Physics]]

[[Category:Physics]]