Unit-I
1. Deduce the mathematical expressions for electrical conductivity and thermal conductivity of a
material and hence obtain widemann - franz law. (6+8+2)
2. Derive an expression for the density of states and based on that calculate the carrier concentration in metals .(12+4)
3. Write Fermi-Dirac distribution function. Explain how Fermi function varies with temperature.
Evaluate the Fermi function for energy KT above the fermi energy. (2 + 10 + 4)
Unit-II
1. Derive an expression for the density of electrons and holes in an intrinsic semi conductor (8+8)
2.(i) Discuss the variation of Fermi level with temperature in an intrinsic semi conductor (8)
(ii) Describe the method of determining the band gap of an intrinsic semiconductor (8)
3. Discuss the carrier concentration, variation of Fermi level with temperature in case of p-type and n-type semiconductors for high and low doping levels (8+6+2)
4. What is Hall Effect? Derive an expression for hall coefficient. Describe an experimental setup for determining the hall coefficient. (2+8+6)
Unit-III
1. Distinguish between dia, para, ferro and anti ferro magnetic materials. Mention their properties and applications (16 Marks)
2. Explain domain theory of ferromagnetism. Using that how will you explain the properties of ferromagnetic materials (16 Marks)
3. Explain the magnetic principle involved in data storage and hence explain the magnetic memories (i) Magnetic tapes (ii) Floppy disk and (iii) Hard disk (4+4+4+4)
4. Discuss the properties of super conductors ( 6 Marks )
Distinguish between Type – I and Type- II Super conductors (6 Marks)
Write a note on high temperature super conductors (4 Marks)
5.Write a short note on
(i) Meissner Effect (ii) Josephson Effect (iii) SQUID and (IV) Magnetic levitation
Unit- IV
1. Explain the different types of polarization mechanisms involved in dielectric materials (16 Marks)
2. What is meant by local field in a dielectric and how it is calculated for cubic structure? Deduce the Claussius- Mosotti equation ( 16 Marks)
3. What are the different types of dielectric breakdown occurs in a dielectric medium? Discuss in detail, the various types of dielectric breakdown (2 +14)
Unit V
1. Give a detailed account on metallic glasses, their production, types, properties and applications (16 Marks)
2. What are nano-phase materials? Discuss the synthesis, preparation, properties and applications of nano-phase materials (16 Marks)
3. What are shape memory alloys? Write their characteristics. List out any four applications of shape memory alloys (16 Marks)
4. Describe the structure, fabrication, properties and applications of carbon nano tubes (CNT). (16 Marks)