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並前往https://www3.nd.edu/~atassi/Teaching/AME%2060633/Notes/fundamentals_w.pdf

1 Fundamental Solutions to the Wave Equation

The other term is out of phase with the pressure and decays at large distance as 1/r2. The specific acoustic impedance z = p vr. = R + iX = ρ0c0 kr. 1 ...

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