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We know using the formula NdB = 10 log10 (P2/P1) formula proves that -3dB gives us half the power of the input source.
By using the Inverse square law I2/I1 = [d1/d2]2 you can calculate the Intensity in decibels in relation to distance.
For example, if the SPL at I1 is 20dB at a distance of 5 meters (d1), then the intensity of I2 , at a distance of 10 meters from I1 would be 14 dB. This means that the sound would have attenuated by 6dB in a total distance of 15 meteres.
