An-Najah Staff

Measurements of the ultrasonic velocity and absorption at the critical concentration were made as a function of temperature and frequency for the binary mixture of carbon tetrachloride and coconut oil. In addition, viscosity measurements were made. Ultrasonic absorption at 5, 7, 10, 15, 21, 25, 30, and 35 MHz above T _c is analyzed by the dynamic scaling theory of Ferrell and Bhattacharjee [Phys. Rev. A 3 1, 1788 (1985)]. The values of α _c /f ² vs f ^−1.06 show a good agreement with the theory. Also, the experimental values of α/α _c for carbon tetrachloride and coconut oil are compared to the scaling function F(ω*). The temperature and frequency dependence of the velocity are also determined. The coefficient of viscosity of the critical mixture shows a different temperature dependence from that of the pure components.