Medical Physics — Sound & Hearing
The decibel scale and the audible range.
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L = 10\log_{10}\frac{I}{I_0}
I_0 = 10^{-12}\ \text{W/m}^2
\text{pain threshold} \sim 120\ \text{dB}
\text{audible range } 20\text{-}20000\ \text{Hz}