An explosion is detected 100 m away from ground-zero,where the intensity is recorded to be 10⁹ W/m².About 5 s later,the sound wave is recorded 1.5 km away from ground-zero.What will its intensity by at that distance? (We ignore absorption losses in this calculation!) A)4.4 MW/m² B)14.1 MW/m² C)66.7 MW/m² D)200 MW/m² E)1000 MW/m²

Question

Quizplus · Accepted Answer

The intensity of a sound wave decreases with the square of the distance from the source. Using the inverse square law, the intensity at 1.5 km (1500 m) can be calculated as: I = (10^9 W/m²) * (100 m / 1500 m)² = 4.4 MW/m².

An Explosion Is Detected 100 M Away from Ground-Zero,where the Intensity