This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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B.Sc. (Part-III) Semester-VI Examination
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6S-PHYSICS
(Statistical Mechanics and Solid State Physics)
Time : Three Hours] [Maximum Marks : 80
Note :— Attempt all questions.
- (A) Fill in the blanks : 2
- The phase space of N particles have dimensions.
- Quantum statistics is applicable to identical and particles.
- Schottky defects are defects.
- Superconductors are perfectly
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- Pauli's exclusion principle is applicable to :
- M-B statistics
- B-E statistics
- F-D statistics
- None of these
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- Structure of NaCl crystal is :
- BCC
- FCC
- Simple cubic
- Hexagonal
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- For diamagnetic materials, magnetic susceptibility is :
- small and negative
- small and positive
- large and negative
- large and positive
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- Nanometer is equal to :
- 10-6m
- 10-7m
- 10-8m
- 10-9m
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- What are Bosons ?
- What is point defect ?
- What is Curie temperature ?
- On what factors properties of nanomaterial depend ?
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- (A) Write expression for thermodynamic probability in M-B distribution and find expression for M-B distribution law. : 6
(B) By using M-B distribution law of molecular speed show that root mean square speed of gas molecule is given by Vrms. 4--- Content provided by FirstRanker.com ---
(C) Find the thermodynamic probability for four distinguishable particles for the microstate (2, 2). 2
OR - (P) State and explain principle of priori probability. 4
(Q) Show that most probable velocity of gas molecule is Vp. 4
(R) Explain the terms :- Thermodynamic probability
- Statistical weight.
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- (A) What are the main postulates of Fermi-Dirac statistics ? 4
(B) Using Bose-Einstein distribution law, deduce an expression for Planck's law of energy distribution in black body radiation. 7
(C) What is Fermi energy ? 1--- Content provided by FirstRanker.com ---
OR - (P) Explain the concept of distinguishable and indistinguishable particles. 3
(Q) Obtain an expression for Fermi-Dirac distribution law by assuming thermodynamic probability. 5
(R) What is Fermi function ? How it behaves at absolute zero ? 4 - (A) Define unit cell of crystal. Explain primitive and non-primitive unit cell. 4
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(B) Derive Bragg's law for diffraction of X-rays. 4
(C) What is line defect in crystal ? Explain the screw dislocation in crystal with neat diagram. 4
OR - (P) Give the names of seven crystal systems and state the parameters of their unit cells. 6
(Q) What are Miller indices ? Find Miller indices of the plane having intercepts (a, 2b, c/2). 4--- Content provided by FirstRanker.com ---
(R) What is reciprocal lattice ? 2 - (A) Obtain an expression for electrical conductivity in terms of mean free path of electrons. 4
(B) Discuss formation of insulator, semiconductor and conductor on the basis of band theory of solid. 6
(C) What are conduction electrons ? 2
OR - (P) Explain the motion of electron in metals and hence derive an expression for drift velocity of electron. 5
(Q) Explain qualitatively conduction band, valence band and energy gap in solids. 4
(R) Explain nearly free electron model. 3 - (A) State properties of paramagnetic materials. 4
(B) Explain ferromagnetism on the basis of domain theory. 4--- Content provided by FirstRanker.com ---
(C) What is magnetic dipole moment ? Obtain an expression for orbital magnetic dipole moment. 4
OR - (P) Give Langevin's theory of paramagnetism; hence prove that the susceptibility of paramagnetic material is inversely proportional to absolute temperature. 8
(Q) State properties of diamagnetic material. 4 - (A) Give brief idea of BCS theory of superconductivity. 6
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(B) Explain type-I and type-II superconductor. 4
(C) Define:- Critical temperature
- Critical magnetic field.
- (P) Explain importance of surface to volume ratio and quantum size effect in nanomaterials. 6
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(Q) State any four applications of nanomaterials. 4
(R) What are nanomaterials ? 2
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This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university