MSc Physics (Electronics I) SEM I 2022 2023 Jan 2023 PHYSICS SOLID STATE PHYSICS Question Paper - Mumbai University | munotes

Questions asked in this paper

• N.B. (1) Figures to the right indicate full marks

1. Q1 a) Attempt any one
   • (i) the elastic scattering monochromatic plane by a monoatomic sample, 8 determine the expression for the structure factor for a crystal of N cells of diffraction condition is satisfied for any plane
   • (ii) Briefly explain Powder method of x-ray diffraction 8
   • b) Attempt any one
   • (i) Write a short note on Ewald construction. 4 Gi) Draw a labelled diagram of a Laue diffractometer. 4
2. Q2 a) Attempt any one
3. Q1 Explain quantization of lattice vibration and inelastic scattering of neutron by 8 marks
   • ii) What is harmonic approximation? Obtain the dispersion relation for 8 acoustical branch in crystal with two atoms per basis
   • b) Attempt any one
   • (i) What are the factors affecting the thermal conductivity in insulators. Show 4 graphically how thermal conductivity varies with temperature
   • (ii) short note on phonon momentum. 4
   • a) Attempt any one
4. Q1 Discuss the quantum theory of paramagnetism and deduce the Curie Law. 8 marks
   • ii) Describe the method of adiabatic demagnetisation of paramagnetic salt. 8
   • b) Attempt any one Write a note on magnetic properties of rare earth elements. Explain the term 4
   • ii) State and explain Curie-Weiss law. 4
5. Q4 a) Attempt any one
   • i) Explain temperature dependence magnetization in 8 ferromagnetic materials with the help of graphical solution
   • ii) | What is ‘Bloch wall’? Determine the total wall energy per unit area. 8 Paper Subject Code: 94680 Physics: Solid State Physics (Rev)
   • b) Attempt any one
6. Q1 Write a short note on neutron magnetic scattering. 4 marks
   • ii) Write a short note on saturation magnetization at absolute zero temperature. 4
7. Q5 Attempt any four 12 marks
   • (i) the fundamental reciprocal lattice vectors for a simple cubic lattice with
   • (ii) With suitable diagram explain the construction of the first Brillouin zone in
   • (iii) is harmonic theory? State the consequences of it
   • (iv) Find the maximum normal mode angular frequency in a linear monoatomic chain where the mass of each atom is 6.09x 104-26 kg and the speed of sound is 1040m/s. assume harmonic interactions
   • (v) State and explain Hund’s first rule with suitable example
   • (vi) nuclear demagnetization method to obtain lower temperatures
   • (vii) Write a note on ferrites Write a short note on Iron Garnets

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