Sound WavesHard
Question
A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of : -
Options
A.1000
B.10000
C.10
D.100
Solution
dB = 10 log 
⇒ 20 = 10 log
⇒ I2 = 100 I1 (taking antilog)
⇒ 20 = 10 log⇒ I2 = 100 I1 (taking antilog)
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