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Two plane sonic waves of same frequency ...

Two plane sonic waves of same frequency are travelling in a homogeneous medium. Loudness recorded by a moving detector in the medium varies from `L_(1) = 30 db " to" L_(2) = 43 . 9794 ` dB . Calculate intensity of the two waves.
Give `log_(1) 2 = 0 . 30103 `

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