Question

The distance between a sound source and a listener is decreased to half the initial distance. What is the change in the amplitude of the sound heard?
It decreases by half the initial amplitude.
It increases by four times the initial amplitude.
It decreases to one fourth the initial amplitude.
It increases by two times the initial amplitude.

Answer 1

Here's a way to think of it: when a sound source gets closer to you, what happens to the loudness? And how is loudness related to the amplitude of sound waves?

Also, you have been asking physics questions. Please post them in the physics section. :)