Homework Statement
Decibel level from source at 1.0 m is 60.0 dB
Find dB level at distance 2.0 m.
Homework Equations
dB = 10 log10 (I/I0) <- this one I know but couldn't see an application.
Forgot to add that I0 is equal to 1.0 x 10^-12 W/m^2
dB = dBi - 20 log10 (r2/r1)...