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Elastic Waves. Acoustics.

Problem 4.163

A point isotropic source with sonic power \(P=0.10 \mathrm{~W}\) is located at the centre of a round hollow cylinder with radius \(R\) \(=1.0 \mathrm{~m}\) and height \(h=2.0 \mathrm{~m}\). Assuming the sound to be completely absorbed by the walls of the cylinder, find the mean energy flow reaching the lateral surface of the cylinder.

Reveal Answer
⟨Φ⟩=P/V1+(2R/h)2‾=0.07 W\langle\Phi\rangle=P / V \overline{1+(2 R / h)^{2}}=0.07 \mathrm{~W}
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