The intensity of a certain spherical wave is 8.0 W/m^2 at a distance of 1.0 m from the source. If the medium is isotropic and nonabsorbing, calculate the decibel intensity 100m from the source.
The Attempt at a Solution
I know how to use these equations... And to find the original dB level i use
Im just not sure what to do to find intensity 100m away?