The one-dimensional dispersion equation for phonons has the form w = С|sin(ka/2)|. What is the constant C equal if the speed of sound is 5000 m/s? What are the values of the phase v and group u velocities for the wave vector values k = n/2a, -n/2a, n/a, 3n/2a? Which of the given wave vector values correspond to equivalent phonons?

Answer. Format gif