What is the intensity level of a sound whose intensity is 2.0 x 10^(-6) W/m^2

dB = 10 log{ I/Io}

Threshold of hearing: 10^-12 W/m²

dB = 10 log{2x10^6 / 10^-12} = 10 log{2x10^6}

dB = 10 log 2 + 10 log 10^6 = 10*0.3 + 10*6 = 63 dB