Longitudinal sound in silver travels at

PHYSICS · Subjective · Fermi University Physics · Condensed Matter, Materials & Soft Matter · Lattice dynamics and thermal properties of solids · Lattice dynamics and thermal properties of solids

Condensed Matter Physics, Ch Elastic waves and the vibrating chain

Problem

Longitudinal sound in silver travels at vs=3650 m s−1v_s=3650\,\mathrm{m\,s^{-1}}. Silver is face-centred cubic with conventional cube edge 4.086 A˚4.086\,\mathrm{\mathring{A}}, so its nearest-neighbour spacing is a=4.086/2=2.889 A˚a=4.086/\sqrt2=2.889\,\mathrm{\mathring{A}}, and one silver atom has mass M=1.791×10−25 kgM=1.791\times10^{-25}\,\mathrm{kg}. Find silver's bond stiffness KK.

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