Suppose your hearing has an intensity range of 90 decibels under realistic conditions. If you can just stand the sound of a siren at a distance of 1....

Suppose your hearing has an intensity range of 90 decibels under realistic conditions. If you can just stand the sound of a siren at a distance of 1.1 meters, how many meters away can you just hear it? Assume that you and the siren are located on an infinite flat surface so the sound makes a half spherical wave front.