First slide

Intensity of

Question

A sound absorber attenuates the sound level by 20 dB The intensity decreases by a factor of

Moderate

A

10
B

100
C

1000
D

10000

Solution

$ΔL = 10 \log (I_{1} / I_{2}) 20 = 10 \log (I_{1} / I_{2}) or 2 = \log (I_{1} / I_{2}) or 10^{2} = (I_{1} / I_{2}) (I_{1} / I_{2}) = 100$

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