Answer to Question #244512 in Physics for Sri

Question

The number of phonon branch in graphite, with four atoms in the primitive cell, is:

8, out of which 2 are acoustic and 6 optical


9, out of which 3 are acoustic and 6 optical


12, out of which 3 are acoustic and 9 optical


12, out of which 2 are acoustic and 10 optical

Answer 1

The number of phonon branch in graphite, with four atoms in the primitive cell, is 12, out of which 3 are acoustic and 9 optical.