Subject Title: Solid State Physics Prepared by: E Gayathri
Year: III Semester: V Updated on: 29/12/2020
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Unit - I: Crystal Structure
- Define Unit cell.
- Differentiate crystalline and amorphous materials.
- What are Miller Indices and how to find them?
- What are translational vectors?
- What are Reciprocal lattice vectors?
- Write the relation between translational and reciprocal lattice vectors?
- Write Bragg’s law.
- Why only x-rays are used for diffraction?
- What is phonon? Explain optical and acoustical Phonons.
- What are the conditions for x-ray diffraction and Derive Bragg’s law.
- Define atomic and geometrical factors and derive the expressions for the same.
- Explain about Brillouin zones.
- Explain vibrations on a 1D-monatomic chain.
- Explain about qualitative description of phonon spectrum in solids.
- Explain vibrations-modes of 1D diatomic linear lattice.
- Derive an expression for specific heat a solid following classical theory.
- Obtain an expression for heat capacity from Einstein theory of specific heat capacity.
- Using Debye approximation, obtain an expression for specific heat capacity of a solid.
- Derive an expression for specific heat of a solid following classical theory.
- Explain about the types of lattices.
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Unit - II: Magnetic properties of Matter
- Give the classification of magnetic materials and also list their corresponding properties.
- What is Susceptibility?
- Write the Expression for Curie’s law
- What are ferromagnetic domains?
- Draw Hysteresis loop and explain different points on the loop
- What is an energy loss and how it varies with the size of the loop.
- Write the expression for depolarization field.
- Write the relation between Polarizability and dielectric constant.
- Discuss classical Langevin theory of dia, Para magnetism.
- Derive curie’s law from Langevin theory of Para magnetism
- Explain the Weiss’s theory of ferromagnetism.
- Derive an expression for local electric field of an atom.
- Derive Clausius- Mosotti equation.
- What is Polarizability and discuss the classical theory of the same.
- Derive the expressions for Electronic polarizability.
- Obtain the expressions for ionic polarizability.
- Draw and explain about B-H curve.
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Unit - III: Elementary Band Theory
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- Write the conclusions of Kroning -penny model
- Define band gap.
- What are Brillouin zones?
- What is effective mass of an electron?
- Define conductor
- Give the classification of extrinsic semiconductor.
- Define Mobility.
- Define Hall effect.
- Define conductivity.
- Discuss the kronig-penny model for the motion of an electron in a periodic potential.
- Explain the formation of bands
- Define and derive an expression for effective mass of an electron
- What are Brillouin Zones? Construct zones for a square lattice
- Classify the solids into conductors, insulators, and semiconductors on the basis of band theory of solids.
- Based on energy bands, distinguish between conductors, semiconductors, and insulators.
- Distinguish between intrinsic and extrinsic semiconductors.
- Explain about N type and P type semiconductors.
- Explain about electrical conductivity by four probe method.
- Derive an expression for hall coefficient for p type semiconductor.
- Explain the applications of hall effect.
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Unit - IV: Lasers
- What is laser?
- Write the characteristics of laser
- Define absorption.
- Define spontaneous emission.
- Define stimulated emission:
- Define Einstein coefficients.
- Define population-inversion, pumping, superconductivity.
- Define Meissner effect and give its applications.
- Define type I and type II super conductors
- Define metastable state. Give its importance
- Define BCS theory.
- What is laser? Explain the characteristics of lasers.
- Explain about Einstein coefficients.
- Derive the relation between Einstein coefficients.
- Write the differences between spontaneous and stimulated emissions.
- Describe the various methods of pumping in lasers.
- Explain about three level pumping scheme.
- Explain the working of ruby laser with the help of neat diagram
- With the help of a suitable diagram explain the principle, construction and working of a helium-neon laser.
- Define Superconductivity. Give the properties of semiconductors
- State and explain Meissner effect
- Explain type I and type II superconductors
- Derive London’s equations
- Explain BCS theory of superconductors.
- Write short notes on A.C and D.C Josephson effect.
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