Question

5. The phonon dispersion relation in one dimension may be written in the form
C]sin (ak/2). Sketch the form of the curve for the range - 27ack <2nia.
If the velocity of sound in the material s 5000 ms and a 15 0.3 am what is the
value of C! What are the phase and group velocities for k = + x20. - 1/2a,
+ + 3r/2a? Which of these values of k correspond to equivalent phonons?​

Answer 1

Answer:

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