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The propagation of plane sound waves in gases in tubes can be divided into three main types, depending on the radius and frequency involved. These types are described as 'narrow' tube, 'wide' tube and 'very wide' tube propagation. The phase velocity, attenuation and cross section profile of particle relocity etc. are investigated theoretically, and their interrelation pointed out. The factors affecting the validity of Kirchhoff's formulae are considered, and the theory is applied to some recent work.

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