Dispersion of Ultrasonic Waves in the Binary Mixture Nitrobenzene-n-Hexane near a Critical Point

Abstract
We report on recent measurements of the ultrasonic velocity in the binary mixture nitrobenzene-n-hexane in the homogeneous phase above Tc. The observed dispersion in the range 5-55 MHz has been compared with the prediction of a modified form of the Fixman-Kawasaki theory.