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Why do sounds get quieter the further away you are from the source?
Wiki User
∙ 13y ago
Louder or fainter means more intense or less intense of sound vibrations respectively.
Intensity in turn is the energy per unit area.
Imagine the source of sound to be at the centre of a sphere. When you are far away then the radius of the sphere would be larger and thus the surface area of the sphere also becomes larger.
As the energy given out by the source of sound is divided by larger area to get the intensity its value becomes lesser. Hence fainter.
Ear drums and microphone diaphragms are moved by sound pressure.
Note: Sound power (sound intensity) is the cause - and the sound pressure is the effect. The effect is of particular interest to the sound engineer.
Another Perspective:
The intensity (loudness) of sound decreases with the square of the distance from the source.
Wiki User
∙ 13y ago
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