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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![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?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe2962121-0a97-46bc-b1d6-6f63cad67dd3%2F96731cb8-92b0-4171-8016-6f733e374ace%2Ffj5zisv_processed.jpeg&w=3840&q=75)
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