Answer to Question #220837 in Physics for Lizzy

Question

What is the interference in Wm/2 of 85dB sound?

Answer 1

The intensity level of the sound

$$\beta=10\lg\frac{I}{I_0}$$

So, the intensity of the sound

$$I=I_0*10^{\beta/10}\\=10^{-12}*10^{85/10}=3.2*10^{-4}\:\rm W/m^2$$