The [[Intensity]] of a [[Wave]] can be expressed in relation to the [[Wave Power]]. $\huge I = \frac{P}{S} = \frac{1}{2}\rho c \omega^{2} A^{2} $ Where $\rho$ is the density of themedium, $\omega$ is the [[Angular Frequency]] of the wave, and $A$ is the [[Amplitude]] of the wave. [[Wave Intensity]] is typically used when describing spherically emitted waves, so in this case the cross-sectional area of the wave $S$ would be equal to $4\pi r^2$, which is the [[Surface Area]] of the sphere of the wave. This relates to the [[Inverse Square Law]] where the intensity of Light (or any spherically propagating wave) is [[Proportional|proportional]] to $\frac{1}{r^{2}}$. $\huge I \propto \frac{1}{r_{2}} $ The units for [[Wave Intensity]] are typically [[Watt|Watts]] per [[Meter|Meter Squared]]. $\huge \dim I = Wm^{-2} $