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

Question

A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of, 100, 1000, 10000, 10

MARKS App · Accepted Answer

L 1 = 10 log I 1 I 0 ; L 2 = 10 log I 2 I 0 ∴ L 1 - L 2 = 10 log I 1 I 0 - 10 log I 2 I 0 or Δ L = 10 log I 1 I 2 or 20 dB = 10 log I 1 I 2 or 10 2 = I 1 I 2 or I 2 = I 1 100 .

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