1. The problem statement, all variables and given/known data At 1 m away from the source of a sound, the intensity of the sound is 90 dB. At 10 m away the intensity is…? The answer is 70 dB but I don't know how... 2. Relevant equations I = Power/Area 3. The attempt at a solution My thought was to set up the equations: 90dB = P/4pi XdB = 4pir^2 I'm not sure where to go from here.