Consider a listener who is a distance $x$ from a loudspeaker. If the listener moves in so that her distance is now $x / 2$ from the loudspeaker, by what factor will the intensity of the sound increase?
A) 2
B) 3
C) 1.5
D) 4

Question

Quizplus · Accepted Answer

The intensity of sound is inversely proportional to the square of the distance from the source. So, if the distance is halved, the intensity increases by a factor of $(2)^2 = 4$.

Consider a Listener Who Is a Distance xxx From a Loudspeaker x/2x / 2x/2

Consider a Listener Who Is a Distance $x$ From a Loudspeaker $x / 2$