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Forensic Engineering Fundamentals
book

Forensic Engineering Fundamentals

by Harold Franck, Darren Franck
December 2012
Beginner to intermediate content levelBeginner to intermediate
487 pages
17h
English
CRC Press
Content preview from Forensic Engineering Fundamentals
107Mold and Environmental Problems
e energy propagated by a sound wave is a function of its intensity. Conversely, the inten-
sity of the wave is the average power per unit area. e power per unit area of a sound wave
equals the excess pressure times the particle velocity. e intensity over one cycle is given by
I
P
v
=
2
2ρ
(4.12)
where
I is the intensity
P is the pressure amplitude
ρ is the average density of air
v is the velocity of the sound wave
Since the human ear has a large range of intensities over which it responds, a logarithmic scale
is used instead of a linear scale. e intensity levels are then expressed in decibels or dBA where
dBA = 10
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Publisher Resources

ISBN: 9781439878392