Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10^-7 W/m². Another student is 4.0 m away from the talkers. What sound intensity does the other student measure? A)6.2 × 10^-8 W/m² B)1.5 × 10^-⁷ W/m² C)8.3 × 10^-8 W/m² D)7.8 × 10^-7 W/m² E)2.5 × 10^-8 W/m²

Question

Quizplus · Accepted Answer

The sound intensity decreases with the square of the distance from the source. Using the inverse square law, the intensity at 4.0 m is (3.0/4.0)^2 times the intensity at 3.0 m, which calculates to 6.2 × 10^-8 W/m^2.

Two People Are Talking at a Distance of 3