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Die Schallabsorption im flussigen Helium

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The acoustical properties of liquid helium between absolute zero and the boiling point are characterised by the following data: at the λ-point the velocity of sound has a minimum, the density a maximum and the sound absorption has a very sharp and high maximum, free from relaxational phenomena. Below the λ-point is a second absorption maximum. Towards absolute zero the absorption of sound asymptotically approaches zero. Below the λ-point the effect of second sound is observed.

With the help of the theory of the collision coefficient develloped in [1] the course of the absorption of sound is easily calculated for the entire temperature range from both velocities of sound and the density. It is shown that the existence of second sound has significant influence on the absorption of the first sound. The quantum hydrodynamic hypothesis of phonons, rotons and the two-liquid model are not used for the description of the sound absorption curve.
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Document Type: Research Article

Publication date: January 1, 1962

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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