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Communication Systems - Engineering

Q1:

If sound intensity is 8 W/m2, the dB level of this sound is about

A 5 dB

B 50 dB

C 129 dB

D 1290 dB

ANS:C - 129 dB

10 log10( 8/(1*10^(-12))).

(10 log(8000000000000))/(log(10)).

=> 129.0308998699194358564121668417347908030456964438632562