You live on a busy street, but as a music lover, you want to reduce th

socorraob 2021-12-18 Answered
You live on a busy street, but as a music lover, you want to reduce the traffic noise. (a) If you install special sound-reflecting windows that reduce the sound intensity level (in dB) by 30 dB, by what fraction have you lowered the sound intensity (in W/m2)? (b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the sound intensity level?
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Expert Answer

porschomcl
Answered 2021-12-19 Author has 28 answers

Intensity in decibels is measured by the formula=
Intensity(dB)=10log10IoI.
part (A)
I=reference intensity which is taken as: 1012 Wm2
let Io = reduction of sound level intensity in Wm2
30=log10(Io1012)
103×1012=Io
Io=1×109Wm2
Now in part B
if change in intensity =12Io
then change in decibel, γ=10log10[1092×1012]
=26.98 dB

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