Exponentially Decaying Traveling Waves
Let
denote the decay factor associated with
propagation of a plane wave over distance
at frequency
rad/sec. For an ideal plane wave, there is no ``spreading
loss'' (attenuation by
). Under uniform conditions, the
amount of attenuation (in dB) is proportional to the distance
traveled; in other words, the attenuation factors for two successive
segments of a propagation path are multiplicative:



Frequency-independent air absorption is easily modeled in an acoustic simulation by making the substitution





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