Why does the further sound travel the quieter it becomes?

Answer 1

Because the further it goes, it loses Power like Electricity and so it deforms until you cant hear it.

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Why is this in "Shopping"?

Anyway, sort of. It does not so much lose power as spread it over an area expanding as the square of the distance. So for example, the intensity at 100m is only a quarter that it is at 50m from source.

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It is also absorbed by the air, and this extra loss rises with frequency.

Answer 2

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PHYSICS