# The warning tag on a lawn mower states that it produces noise at level of 91.0dB. What is this in Wm^-2?

##### 1 Answer

Oct 7, 2015

#### Explanation:

According to the equation for sound level

where

Substituting in the given data and solving for the required unknown, we get :

#therefore 10^(9,1)=I/(10^-12)