sound in physics help?

Question

a source emits sound uniformly in all directions. There are no reflections of the sound. at a distance r1 from the sourcee the sound is 12 dB louder than it is at a distance r2 from the source. What is the ratio r1/r2?

Answer 1

Check these links out.
Reference 1 gives you power lost
Reference 2 gives the equation of power loss due to wave propagation