Answer to Question #250493 in Physics for mahri

Question

What is the intensity of sound waves produced by a piano at a distance of 1.5 m when the power output of the piano is 3.0 W? 

Answer 1

The intensity of sound waves is subjected to the inverse square law, it is the sound power divided by area:

$$I=\frac P{4\pi r^2}=0.106\text{ W/m}^2.$$