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Two sound waves of slightly different frequency have amplitude ratio 11/9. What is the difference of sound levels in decibels of maximum and minimum intensities heard at a point?

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Detailed Solution

[ Step 1]:SL2−SL1=10log⁡ImaxImin[ Step 2]:=10log10I1+I22I1−I22=10log10a1a2+12a1a2−1210log10119+12119−12=20log1020929=20log1010=20dB

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Two sound waves of slightly different frequency have amplitude ratio 11/9. What is the difference of sound levels in decibels of maximum and minimum intensities heard at a point?