We can use the formula for sound intensity level (in dB) to find the intensity (in W/m²):
$L = 10 \log_{10}(\frac{I}{I_0})$
Where $L$ is the sound intensity level (85 dB), $I$ is the intensity of the sound, and $I_0$ is the reference intensity ($10^{-12}$ W/m²).
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