Abstract
A CONSEQUENCE of the theory put forward /JL in 1941 by the Soviet physicist, Landau, to explain the peculiar flow-properties of liquid helium1 was the co-existence of two speeds of sound in this medium. Prof. E. N. da C. Andrade, in his recent account2 of contemporary physical research in the U.S.S.R., stated that Peshkov had succeeded in demonstrating that a 'second' sound did actually occur in helium-II. A paper giving details of the theoretical background and the experimental technique used was delivered earlier in 1945 by E. M. Lifshits and V. P. Peshkov before a gathering of the Physico-Mathematical Section of the Academy of Sciences of the U.S.S.R., and a summary of the work appears in an issue of the Academy's Herald, which has recently been received3.
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References
See Smith, G. S., Nature, 155, 598 (1945).
Andrade, E. N. da C., Nature, 156, 223 (1945).
Vestnik Akademii Nauk, No. 4, 117 (1945).
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SMITH, G. Two Velocities of Sound in Helium-II. Nature 157, 200 (1946). https://doi.org/10.1038/157200a0
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DOI: https://doi.org/10.1038/157200a0