A woman stands a distance d from a loud motor that emits sound uniformly in all directions.

Question:

A woman stands a distance d from a loud motor that emits sound uniformly in all directions. The sound intensity at her position is an uncomfortable 3.2 × 10-3 W/m2. There are no reflections. At a position twice as far from the motor, what are
(a) The sound intensity
(b) The sound intensity level relative to the threshold of hearing?