Answered: M K 2-111 | 00000 1 Un-1 "n Figure 5 1…

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Consider the 1-dimensional linear chain in the Figure 5 below with N atoms in the chain. How many vibrational branches will be in the dispersion relation ?

M K
|
1
000000
141-2
|
a
000000
1 Un-1
Un
Figure 5
000000
1+1
I U
Un+2

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M K 2-111 | 00000 1 Un-1 "n Figure 5 1 U+1 1 Un+2