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## Homework Statement

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.

## Homework Equations

β=10ln(I1/I0)

## The Attempt at a Solution

I know how to use these equations... And to find the original dB level i use

β=(10dB)ln(8.0/10^-12)

Im just not sure what to do to find intensity 100m away?