Why does sound become faint with distance?
Sound grows more faint as you move away from the source for two reasons: attenuation and diffusion. Sound energy attenuates as it passes through a medium, until eventually all the sound energy is lost to friction. So the further away you are from the source, the more the sound has attenuated before reaching you..Diffusion occurs because the sound wave expands in all directions. Assuming no attenuation, the amount of acoustic energy striking any given surface area (your ear drum, for example) is inversely proportional to the square of the distance to the source, so as you move away from the sound, the amount of acoustic energy declines exponentially.
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