HIGHLIGHTS
SUMMARY
The control of sound propagation through the design of the mesoscale structure is one of the new frontiers in Condensed Matter Physics. In general, how a liquid resists sound propagation depends on the dynamic window; at low frequencies, viscous dissipative processes such as diffusion and relaxation play a primary role in sound damping. A density fluctuation propagating through multiple randomly-oriented crystallites acquires a variety of sound velocities, thus getting fragmented into different acoustic modes whose mutual interference ultimately enhances the sound damping. Density fluctuations propagating through such a system are redistributed again into . . .
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