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

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detailed solution

Correct option is D

Let intensity of sound be I and I’. Loudness of sound initially β1=10log⁡IIo Later, β2=10log⁡I1Io′ β1−β2=20 ∴20=10log⁡II′ or I′=I100

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