Given information
Given values:
Formula used:
A person standing a certain distance from an airplane with
equally noisy jet engines is experiencing a sound level of 
dB.
Step-by-step explanation
Sound intensity is given by
and is inversely proportional to the square of the distance 
from the source.
The sound level is indicated using a logarithmic scale since the human ear can detect a wide variety of levels.
The equation
can be used to calculate sound level 
, where Io is the reference intensity and 
is the minimum intensity audible to humans, and 
is the intensity of a particular wave.
The power carried by sound waves per unit area in a direction perpendicular to that region is described as sound intensity, also known as acoustic intensity. The watt per square metre 
is the SI unit of intensity, which includes sound intensity.
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Physics: Principles with Applications
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