A stereo speaker represented by P in Figure 13-22 emits sound waves with a power output of 130.0 W. What is the intensity of the sound waves at point x when r = 6.0 m?

Question

Figure 13-22

Answer 1

The formula for sound Intensity I = P/A

Where P represents Power in Watts;

A is the area of a sphere as the sound moves away from the point p in all directions.

I=P/A A=4πr² r is the radius

We are given: Power = 130.0 W; r=6.0m

We are asked to determine the Intensity at x.

I = 130.0W/(4π(6.0m)²)

I = 0.287363.. The values given show 2 significant digits. So I=0.29W/m²

Hope this helps..