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

G1 Physics · Accepted Answer

Step 1: A decrease by 20 dB means 10log₁₀(I₂/I₁) = −20. Step 2: I₂/I₁ = 10⁻². Hence intensity decreases by a factor 100. Final: D.