Sound Intensity

Intensity of a Point Source

A speaker radiates power P (watts) equally in all directions. At distance r, that power is spread over a sphere of surface area $4pi r^2$:

I = rac{P}{4pi r^2}

• I — intensity (W/m²)
• P — acoustic power (W)
• r — distance from source (m)

Inverse-Square Law

Doubling the distance quarters the intensity — the same $r^2$ dependence as gravity and light. This is why outdoor concerts sound quiet from far away.

Your Task

Implement soundIntensity(P, r) returning intensity in W/m².