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1. Sketch to scale the longitudinal and transverse displacement waves on a monoatomic one-dimensional lattice at a wavelength of λ-4a. Locate the vibration frequency of these two acoustical modes on the ω_q -q diagram such as that given by given Figure.

1154_Fig 2.jpg

2. Sketch the phonon spectra of a tertiary compound semiconductor whose primitive unit cell contains three atoms such as Ga_XAI_YAs_x?

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