From the figures for the pho non dispersion curves for si, Ask an Expert

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From the figures for the pho non dispersion curves for Si and GaAs pl us the equations for optic and acoustic phonons, explain why the energy for the Si curves is h igher in energy than the curves for GaAs? Assume that the elastic constant is about the same for both materials. Also, why do the optical and acoustic phonon branches cross at the zone boundary for Si but not for GaAs?

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