(a) Make a sketch similar to Figure 22.3 for the displacement of atoms when the phonon’s wavelength is exactly 2/5 of the atomic separation d.
(b) Is this distinguishable from a phonon with wavelength (2/3)d?
(c) Both these would be indistinguishable from a phonon whose wavelength λ is longer than the atomic separation: λ = xd with x ≥ 2. What is the value of x?
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