A) 70 decibel
B) 72.9 decibel
C) 81 decibel
D) 60 decibel
Correct Answer: B
Solution :
After passing the 3 meter intensity is given by \[{{I}_{3}}=\frac{90}{100}\times \frac{90}{100}\times \frac{90}{100}\times I=72.9%\ \text{of }I\] So, the intensity is 72.9 decibel.You need to login to perform this action.
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