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Solid State Physics
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Q61

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The dependences of the magnetic susceptibility

(χ)

of a material with temperature (T) can be represented by

χ \propto \frac{1}{T - θ},

where θ is the Curie-Weiss temperature. The plot of magnetic susceptibility versus temperature is sketched in the figure, as curves P, Q and R with curve Q having θ = 0. Which one of the following statements is correct?
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Q62

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In a crystal of N primitive cells, each cell contains two monovalent atoms. The highest occupied energy band of the crystal is

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Q63

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For a closed packed bcc structure of hard spheres, the lattice constant a is related to the sphere radius R as

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Q64

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Match the following and choose the correct combination:

Group 1 (Characteristic)	Group 2 (Element)
P. Atomic configuration 1s², 2s² 2p⁶, 3s² 3p⁶	1. Na
Q. Strongly electropositive	2. Si
R. Strongly electronegative	3. Ar
S. Covalent bonding	4. Cl

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Q65

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Two dielectric materials A and B exhibit both ionic and orientational polarizabilities. The variation of their susceptibilities

χ (= ε_{r} - 1)

with temperature T is shown in the figure, where

ε_{r}

is the relative dielectric constant. It can be inferred from the figure that
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Q66

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If the static dielectric constant of NaCl crystal is 5.6 and its optical refractive index is 1.5, the ratio of its electric polarizability to its total polarizability is

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Q67

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In an insulating solid which one of the following physical phenomena is consequence of Pauli's exclusion principle?

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Q68

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The energy of a ferromagnet as a function of magnetization M is given by F(M) = F₀ + 2(T - T_c) M² + M⁴, F₀ > 0
The number of minima in the function F(M) for T > T_c is

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Q69

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A sample of silicon of thickness 200 μm is doped with 10²³ phosphorus atoms per m³. If the sample is kept in a magnetic field of 0.2 Wb/m² and a current of 1 mA is passed through the sample, the Hall voltage produced is

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Solid State Physicspractice.

Solid State Physics
practice.