1. The problem statement, all variables and given/known data A car horn sounds and 15 m away the sound level is recorded as 85 dB. Calculate the decibel level 25 m away from the horn. 2. Relevant equations β = (10dB)logI/Io β = (20dB)logP/Po 3. The attempt at a solution I = P/A @ 15m A = 4∏r2 A = 2827 I = 15/2827 = 0.005W/m β = 10dBlog0.005/10-12 = 87dB I = P/A @ 25m A = 4∏r2 A = 7854 I = 25/7854 = 0.003W/m β = 10dBlog0.003/10-12 = 85dB I dont know if I'm even heading in the right direction with this one!