Second Sound Attenuation in Liquid Helium II

Abstract
Second sound attenuation was measured in the hundred kilocycle per second frequency range with a continuous wave method. Measurements were carried out over the temperature interval from 1.25°K to 2.17°K. The short wavelengths employed and the absence of walls near the second sound beam caused geometrical attenuation and wall losses to be negligible compared to the actual liquid attenuation.

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