Sound pressure amplitude falls off as the inverse of distance from a source

Evidence

Equation 6.1 shows that the intensity of the direct sound reduces as the square of the distance from the source, in the same way as a sound in free space. This has important consequences for listening to sound in real spaces. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1691 (#corroborates, via linked claim)

Categorization

• XREF: connects to: Direct sound intensity falls with the square of distance from the source — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1691; Sound intensity falls off as distance squares only in free field, boundary-free conditions; Sound intensity level and sound pressure level are roughly equivalent (+6 more)

Broader Connections

• Direct sound intensity falls with the square of distance from the source #corroborates (0.95) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1691
• Sound intensity falls off as distance squares only in free field, boundary-free conditions #qualifies (0.90)
• Inverse-square law governs direct sound intensity even inside enclosed spaces #corroborates (0.85)
• Sound intensity level and sound pressure level are roughly equivalent #expands (0.80)
• Distance makes sound quieter and duller as air absorbs high frequencies #qualifies (0.75)
• Sound diffraction arises from gradual pressure decay, not abrupt wave cutoff #expands (0.70)
• Sound power level can be derived by dividing intensity by radiating area #expands (0.70)