From experiments on inelastic neutron scattering on a KBr crystal, it is known that the maximum frequency of phonons corresponding to acoustic transverse vibrations of the atoms of the edges of its cubic lattice is w = 7.85 • 1012 s-1. Using the model of vibrations of a one-dimensional chain, estimate the speed of transverse sound vibrations along this direction. Crystal density p = 2.75•103 kg/m3.
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