In a n experiment to determine the speed of sound using a resonance column prongs of tuning fork are kept in
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D Schmoranzer, M La Mantia, G Sheshin, I Gritsenko, A Zadorozhko, M Rotter, L Skrbek
Journal of Low Temperature Physics 163 (5-6), 317-344, 2011
Abstract We report on experimental investigations of acoustic emission by quartz tuning forks resonating at frequencies 32 kHz, 38 kHz, 77 kHz and 100 kHz immersed in cold gaseous 4 He and its normal and superfluid liquid phases. Frequency dependence of the observed low-drive-linewidth at 350 mK together with the temperature and pressure dependences (1.3 K< T< 4.2 K, 0< p< 25 bar) of the observed damping of the high frequency (77 and 100 kHz) resonators measured in normal liquid 4 He and its superfluid phase …
Journal of Low Temperature Physics 163 (5-6), 317-344, 2011
Abstract We report on experimental investigations of acoustic emission by quartz tuning forks resonating at frequencies 32 kHz, 38 kHz, 77 kHz and 100 kHz immersed in cold gaseous 4 He and its normal and superfluid liquid phases. Frequency dependence of the observed low-drive-linewidth at 350 mK together with the temperature and pressure dependences (1.3 K< T< 4.2 K, 0< p< 25 bar) of the observed damping of the high frequency (77 and 100 kHz) resonators measured in normal liquid 4 He and its superfluid phase …
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