130 = 10*log(I/I0) = 10*[log(I) + 12] 13 = log(I) + 12 log(I) = 1, I = 10 W/m^2

covering an area of 4*π*(1.3^2),

the total power is 10*4*π*(1.3^2) W.

=212.37 W

85 dB = 10*[log(I) + 12]

log(I) = -3 .5

I = 10^-3.5 W/m^2

212.37/(4*π*r^2) = 10^-3.5

r^2=212.37/(4*pie*10^-3.5)

=53442

r= 231 m

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