Author: Azzamov, Zulfiqor Abruy o‘g‘li

Annotation: A study was made of the nature of hypersound propagation in an aqueous solution of 4-methylpyridine with a concentration of 0.06 m.f. by method of Mandelshtam-Brillouin light scattering spectroscopy. It is shown that a positive sound velocity dispersion is observed in the studied solution in the frequency range from 5.4 MHz to 4.8 GHz, which is due to the process of bulk viscosity relaxation. In a narrow frequency range from 4.8 to 6.1 GHz, a negative dispersion of the hypersonic velocity has been experimentally revealed. The negative dispersion is associated not with the relaxation process, but with the spatially inhomogeneous structure of the solution on scales comparable to the hypersonic wavelength

Keywords: Hypersound, Mandelshtam-Brillouin, Ultra-and hyperacoustic parameters, 4-methylpyridine, ultrasonic speed, Fabry-Perot, Cylindrical glass, calculation, Mandelstam-Leontovich relaxation theory, Navier-Stokes.

Pages in journal: 872 - 880