`I = P_s/(4pir^2)`

Enter a value for all fields

The intensity S of an electromagnetic wave refers to the power per area the wave imparts if it is absorbed by a surface. The intensity is determined by the strength of the magnetic and electric fields

The equation is expressed as

`I=P_s/(4pir^2)`

where 

• `P_s` is the power of source
• `4pir^2` is the surface area of the sphere