Intensity of Electromagnetic Radiation

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

$"Power"$

$"Distance"$

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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