1 explain why there is no optical phonon i n the d, Ask an Expert

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1. Explain why there is no optical phonon i n the d ispersi on curve for the one-dimensional monatomic chain of atoms.

2. Explain why there is a forbidden range of vibration energies between the optic and acoustic phonon branches. Solve Eq. ( 5.22 ) for the case when k=nla.

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