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4. | A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor of? | |
A. | 100 | |
B. | 1000 | |
C. | 10000 | |
D. | 10 | |
Answer: Option A | |
Explanation: | |
L1=10log(I1/I0) L2=10log(I2/I0) |
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