Question:

Apart from the acoustic modes, 9 optical modes are identified from the measurements of phonon dispersions of a solid with the chemical formula AnBm A_nB_m , where A A and B B denote the atomic species, and n n and m m are integers. Which of the following combinations of n n and m m is/are possible?

Updated On: Jul 12, 2024
  • n=1,m=1 n = 1, m = 1
  • n=2,m=2 n = 2, m = 2
  • n=3,m=1 n = 3, m = 1
  • n=4,m=4 n = 4, m = 4
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The Correct Option is B, C

Solution and Explanation

The correct Answers are (B): ,(C):
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