A law of physics states that the intensity of sound is inversly propotionla to the square of the distance d from from the source :
(a) Use this model and the equation (described in this section ) to show that the decibel levels at at distances and froom the sound source are related by the equation:
(b) The intensity level at the rock concert is 120 db at a distance of 2 m from the speakers. Find the intensity level at a distance of 10 m.
from the source: 
.
and 
at distances 
and 
from a sound source are related by the equation
