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Zero sound in liquid 3He

The velocity and attenuation of sound and zero sound have been measured at a frequency of 120 MHz. The velocity increases by 5.6+or-0.3 m s-1 over a temperature range centred on 34+or-3 mK, while the attenuation rises to a maximum value of 700 cm-1. These results are comparable with those of Abel et al. at 15 and 45 MHz, and in agreement with the Landau theory with the parameter F2 approximately equal to zero. A comparison of the values for the velocity with previous values for the impedance at 122 MHz shows that the fractional change in the impedance at the transition is larger than the fractional change in the velocity. This result appears inconsistent with the Bekarevich-Khalatnikov treatment of the impedance.