Ultrasonic Velocity and Attenuation in Liquid Neon
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The velocity and attenuation of 30-MHz sound waves were measured in liquid neon from 25 to 37K at pressures to 28 kg/cm2. The values of the velocity, extrapolated to the vapor pressure curve, are from 1.5% higher at 25K to 0.4% higher at 32K than corresponding values reported for 2-GHz sound waves. This negative dispersion is in agreement with recent predictions by Fleury and Boon. Values of the attenuation exceed the classical values calculated from the Navier-Stokes equation. This excess attenuation is attributed to a volume viscosity of the same magnitude as the shear viscosity. No anomaly in the temperature dependence of either velocity or attenuation was observed near the temperature where an anomaly has been reported for thermal conductivity, shear viscosity, and hypersonic velocity.
