A point source emits sound with a power output of 100 watts. What is the intensity (in W/m²) at a distance of 10.0 m from the source? A) 7.96 × 10−² B) 7.96 × 10−¹ C) 7.96 × 10⁰ D) 7.96 × 10¹ E) 7.96 × 10−³

Question

Quizplus · Accepted Answer

The intensity of sound is given by the equation I = P/4πr^2, where P is the power output of the source and r is the distance from the source. In this case, P = 100 W and r = 10.0 m, so I = 100 W / 4π(10.0 m)^2 = 7.96 × 10−2 W/m^2.

A Point Source Emits Sound with a Power Output of 100