QUESTION 46 In a cubic crystal, atom of mass M₁ lie on one set of planes and atoms of the mass M₂ lie on planes interleaved between those of the first set. If C is the force constant between nearest neighbors planes, the frequency of the lattice vibrations for the optical phonon branch with wave vector k = 0 is. OA OB. OC. O D.O 2C C C 1 M 1 2M 1 M 1 1 1 + + + 1 M 1 M 1 2M 2
QUESTION 46 In a cubic crystal, atom of mass M₁ lie on one set of planes and atoms of the mass M₂ lie on planes interleaved between those of the first set. If C is the force constant between nearest neighbors planes, the frequency of the lattice vibrations for the optical phonon branch with wave vector k = 0 is. OA OB. OC. O D.O 2C C C 1 M 1 2M 1 M 1 1 1 + + + 1 M 1 M 1 2M 2
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Transcribed Image Text:QUESTION 46
In a cubic crystal, atom of mass M₁ lie on one set of planes and atoms of the mass M₂ lie on planes interleaved between those of the first set. If C is the
force constant between nearest neighbors planes, the frequency of the lattice vibrations for the optical phonon branch with wave vector k = 0 is:
OA.
√√20
2C
OB.
O C.
1
O D.O
M
1
2M
1
1
√
M
+
+
+
1
M
1
M
1
2M
2
2
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