What is the ratio of the iintensitites?

Physics
Tutor: None Selected Time limit: 1 Day

Apr 4th, 2015

57dB/10=5.6dB

so the signal to noise ratio is 10^5.6 dB=398107

Apr 3rd, 2015

the answer was incorrect


Apr 4th, 2015

B = 10 log (I/Io)
57dB = 10 log I/10^-12
10^5.7 = I/10^-12
5 x 10^-7 W/m^2 = I
Background noise is 10^-12
Ratio is 5 x 10^5 : 1

Apr 4th, 2015

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