Abstract
THE velocity of sound in helium I and helium II has been determined by a method similar to that used by Pitt and Jackson1. Standing waves were set up in the liquid between a vibrating quartz crystal and abrass reflecting plate. The crystal was driven near its natural resonance, at a frequency of 1,338 kilocycles per second, maintained constant by means of a quartz crystal master oscillator. The reflector was moved by means of a micrometer screw, and as it passed through the nodal positions, the existence of the standing waves was shown by the resonant reaction on the vibrating crystal. Sharp and easily measurable resonance peaks were obtained in both helium I and helium II, the wave-length being of the order of 0·16 mm. The temperature was controlled by means of the helium vapour pressure.
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References
Pitt, A., and Jackson, W. J., Can. J. Research, 12, 686 (1935).
Keesom, W. H., and Keesom, Miss A. P., Physica, 1, 128 and 161 (1933). Leiden Comm., Supp. No. 76 and earlier papers.
Ehrenfest, P., Kon. Akad. Wetenschappen, 36, 153 (1933). Leiden Comm., Supp. No. 75.
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BURTON, E. Velocity of Sound in Liquid Helium. Nature 141, 970–971 (1938). https://doi.org/10.1038/141970c0
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DOI: https://doi.org/10.1038/141970c0
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