Abstract
A resum\'e of the theory of the ultrasonic interferometer is given and adapted for use with liquid media where the term $\ensuremath{\rho}v$ is very large (approximately ${10}^{5}$) in comparison with that occurring in gases (approximately 40). The differences of the observed phenomena due to this factor are discussed together with a method of obtaining the coefficient of absorption of ultrasonic waves in liquids, and the "effective" coefficient of reflection of the waves at a liquid-metal boundary. Measurements at 2.79 and 8.37 megacycles yield for the "frequency-free" coefficient of absorption in water approximately 19\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}17}$ while the coefficient of reflection varies from 0.7 to 0.9 at boundary surfaces of monel metal and brass.
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