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Power of a sound wave: Definition of Intensity level Beta

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What is the power of a sound wave (B = 32 dB) passing through an area of 12.5 cm^2? Suppose the same sound wave passes through an area of 25 cm^2. What is it's intensity level?

Please explain to me how to use the Definition of Intensity level Beta
B= 10 log (I/Io) in this problem.

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