Answer to Question #2878 in Acoustics for John
L1 = 10 log10(I1/I0) dB
where I1 and I0 are the intensities.
I0 is the standard reference sound intensity
L1 = 10*log10 (I1/I0) = 110 dB - sound level on the front row.
L2 = 10*log10 (I2/I0) = 110 dB - sound level on the back row.
L2=10*log10 (I1/1000)/I0 = 10*log10(I1/I0) + 10*log10(1/1000) = 110 - 3 = 107 dB
Answer : 107 dB.
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