Answered: Question A6 The phonon dispersion curve… | bartleby

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Question A6
The phonon dispersion curve for sodium chloride in the [111] direction is shown below. The unit
cell parameter is a = 5.6402 Å.
Frequency (THz)
0
0.1
0.2 0.3
0.4
0.5
Reduced wavevector (EEE)
What is the speed of sound for longitudinal vibrations in this direction?

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