The dielectric constant of a material at optical frequencies is mainly due to
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Solid State Physics
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The temperature (T) dependence of magnetic susceptibility of a ferromagnetic substance with Curie temperature (Tc) is given by
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Metallic monovalent sodium crystallizes in body centred cubic structure. If the length of the unit cell is 4 × 10-8 cm, the concentration of conduction electrons in metallic sodium is
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In an experiment involving a ferromagnetic medium, the following observations were made. Which one of the plots does not correctly represent the property of the medium?
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For a three-dimensional crystal having N primitive unit cells with a basis of p atoms, the number of optical branches is
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Which one of the following statements is not correct about the Brillouin Zones (BZ) of a square lattices with constant a?
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The kinetic energy of a free electron at a corner of the first Brillouin zone of a two-dimensional square lattice is larger than that of an electron at the mid-point of a side of the zone by a factor b. The value of b is
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The distance between the adjacent atomic planes in CaCO3 is 0.3 nm. The smallest angle of Bragg scattering for 0.03 nm X-ray is
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Which one of the following statements about superconductors is not true?
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Variation of electrical resistivity with temperature T of three solids is sketched (on different scales) in the figure, as curves P, Q and R.
Which one of the following statements describes the variations most appropriately?
Which one of the following statements describes the variations most appropriately?
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The energy of electrons of wave vector in a solid is given by where A and B are constants. The effective mass of the electron at is
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The effective density of states at the conduction band edge of Ge is 1.04 × 1019 cm-3 at room temperature (300 K). Ge has an optical band gap of 0.66 eV. The intrinsic carrier concentration (in cm-3) in Ge at room temperature (300 K) is approximately
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Which one of the following statements is true?
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A linear diatomic lattice of lattice constant a with masses M and m (M > m) are coupled by a force constant C. The dispersion relation is given by
Which one of the following statements is incorrect?
Which one of the following statements is incorrect?
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The Hall coefficient RH of sodium depends on
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Which one of the following axes of rotational symmetry is not permissible in single crystals?
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The potential in a divalent solid at a particular temperature is represented by a one-dimensional periodic model. The solid should behave electrically as
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The c/a ratio for an ideal hexagonal closed packed structure is
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In a powder diffraction pattern recorded from a face centred cubic sample using X-rays, the first peak appears at 30°. The second peak will appear at
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The critical magnetic field for a solid in superconducting state
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