Q39
A cubic cell consists of two atoms of masses m, and m2(m1 > m2) with m1 and m2 atoms situated on alternate planes. Assuming only nearest neighbour interactions, the centre of mass of the two atoms
A.
moves with the atoms in the optical mode and remains fixed in the acoustic mode
B.
remains fixed in the optical mode and moves with the atoms in the acoustic mode
AnswerC.
remains fixed in both optical and acoustic modes
D.
moves with the atoms in both optical and acoustic modes
Answer: Option B
Solution
Answer: Option B
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