Solid State Physics - Study Mode
[#51] In a cubic crystal, atoms of mass M 1 lie on one set of planes and atoms of mass M 2 lie on planes interleaved between those of the first set. If C is the forte constant between nearest neighbour planes, the frequency of lattice vibrations for the optical phonon branch with wave vector k = 0 is
Correct Answer
(A) $$sqrt {2Cleft( {frac{1}{{{M_1}}} + frac{1}{{{M_2}}}}
ight)} $$
[#52] If the ionic radii of Mn and S are 0.80 and 0.184 nm respectively, the structure of MnS will be
Correct Answer
(C) NaG type
[#53] An external magnetic field of magnitude H is applied to a type-I superconductor at a temperature below the transition point. Then which one of the following statements is not true for H less than the critical field H c ?
Correct Answer
(D) The sample exhibits mixed states of magnetization near H c
[#54] Infrared absorption can be observed in which of the following molecules?
Correct Answer
(C) HCl
[#55] The number of independent elastic constants in an isotropic cubic solid is
Correct Answer
(C) 3