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# What is the effect of distance on sound?

Updated: 9/19/2023

Wiki User

13y ago

The sound pressure decreases with distance r in a free field (direct field).

The next question is. How does the sound decrease with increasing distance? After which law?

The sound pressure p diminishes with distance after the 1/r law. Sound pressure decreases inversely as the distance increases with 1/r from the sound source. The Sound pressure level (SPL) decreases by (−)6 dB per doubling of distance from the source to 1/2 (50 %) of the sound pressure initial value.

Sometimes it is said, that the sound decreases with with 1/r², the inverse square law. That is really wrong.

Scroll down to related links and look at "Damping of sound level with distance".

p2 / p1 = r1 / r2 and p2 = p1 x r1 / r2

p1 = sound pressure 1 at reference distance r1 from the sound source.

p2 = sound pressure 2 at another distance r2 from the sound source.

Scroll down to related links and look at "How does the sound or the noise decrease with distance?"

Wiki User

13y ago

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The sound pressure decreases with distance after the distance law 1/r. (No squre!) Our ear drums are only moved by the sound pressure of the air. Scroll down to related links and look at "Inverse Distance law".

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For example when firemen car passes around them. The sound is distorted according to distance in which the car is.

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There is really no standard distance from the sound source where the sound pressure level (SPL) is measured.

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In vaccum there is no sound.

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Are you looking for the inverse distance law? How sound pressure decreases with distance? Scroll down to related links and look at "Sound pressure p and the inverse distance law 1/r".

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