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Sound waves: Power of a sound wave. What is its intensity level.

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 its intensity level?

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a)
B (decibels) = 10*log(I/Io)

where I = intensity, B = 32db, Io = 10^-12 W/m^2 ...

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