so the signal to noise ratio is 10^5.6 dB=398107
the answer was incorrect
B = 10 log (I/Io)57dB = 10 log I/10^-1210^5.7 = I/10^-125 x 10^-7 W/m^2 = IBackground noise is 10^-12Ratio is 5 x 10^5 : 1
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