Factors affecting sound intensity

[somecelxis]

Homework Statement

the factor affecting sound intensity is amplitude and frequency . why not also the distance from the source (r) ,

in my opinion, intensity = power/area , so the intensity = power/ 4 pi r ^2 ... so I is inversely proportional to r^2 ...

Homework Equations

The Attempt at a Solution

 

[BOAS]

I think you should take another look at the definition of intensity and compare it to the definition of power.