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Sound Intensity

Wave & Sound · Inverse Square Law

Sound Lab

Sound Source

10⁻¹² W10⁶ W
0.1 m1000 m
dB Level
39.0
dB SPL
Intensity
7.96e-9
W/m²
Distance
10.0
meters
Power
1.00e-5
watts
OSHA Safe Exposure: Safe for extended exposure

◆ Challenge 1 / 3

At what distance does a Jet Engine drop to 85 dB?

Target: 85 dB · Source: Jet Engine

Current dB:
39.0 dB
@ 10.0 m

Physics

Intensity:
I = P / (4π·r²)
Sound Level:
dB = 10·log₁₀(I / I₀)
I₀ = 10⁻¹² W/m²
Distance Rule:
Each doubling of distance: −6 dB