ACOUSTICAL PROPERTIES OF DIAMOND

Sound waves are carried by vibrations in the low-frequency range (a few hundred Hertz), unlike thermal conductivity and optical absorption which are associated with high-frequency vibrations. 

The structure of diamond favors low-frequency transmission and the material has high sound velocity. Measurements of up to 20 knr /s are reported. By comparison, the speed of sound in beryllium is 12.89 km/s and in silicon slightly less than 10 km/s.( l 

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