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Halliday 2 Cap 18 - P18 024

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    December 2018

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24. Since the power of the sound emitted from a section of the source with unit √ length is related to I by P = IA = 2πrI(r), then we have I(r) = P/(2πr) ∝ r−1 . And since sm ∝ I (by Eq. 18-27), then the fact that I ∝ r−1 in this situation leads to sm ∝ r−1/2 .