Sound wave intensity in terms of displacement amplitude A (13-29)

Question 1 of 5

Question

$\textbf{Intensity}$ of a sound wave

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Question

$\textbf{Density}$ of the wave medium (usually air)

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Question

$\textbf{Angular frequency}$ of the wave

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Question

$\textbf{Displacement amplitude}$ of the wave

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Question

$\textbf{Speed of sound}$ waves in the medium

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Review

Equation 13-28 says that the power associated with the wave is proportional to the square of the wave amplitude $A$ . This turns out to be a general attribute of waves of all kinds, not just sound waves. Note also that the power is proportional to $L^2$ , which is the cross-sectional area through which the wave energy passes. The power $\textit{divided}$ by the cross-sectional area $L^2$ is called the $\textbf{intensity}$ of $I$ of the wave, measured in watts per square meter ( $\mathrm{W}/\mathrm{m}^2$ ). From Equation 13-28, this is