Answer:
Intensity
Explanation:
The intensity of a sound wave is equal to the ratio between to the power emitted by the source divided by the area of the spherical surface through which the wave propagates:

where
P is the power
is the area of the spherical surface
r is the distance from the source
As we see from the formula, the intensity is inversely proportional to the square of the distance from the source:

so, intensity is the correct answer.
When you work out it helps clear your thoughts and think of nothing. It makes you feel good.
<span>a. equal to zero.
</span>because the forces are balance (equal magnitudes, opposite directions)