M.Sc. (Final) DEGREE EXAMINATION, MAY Second Year Physics
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1 Physics Paper - V : ELECTROMAGNETIC THEORY AND MODERN OPTICS (DPHY 21) Answer any Five questions 1) Discuss the phenomenon of reflection and refraction of electromagnetic waves at a plane interface between dielectrics. 2) What do you mean by dispersion? Discuss the phenomenon of dispersion in absorbing media on the basis of electromagnetic theory. 3) Discuss the attainment of population inversion in case of a three - level laser system. Briefly explain the doppler line broadening mechanism. 4) Explain the principle, construction and working of Ruby Laser. 5) Describe the role played by an optical resonator in lasing action. Explain the Threshold condition for laser oscillation. 6) Explain the working of a hologram with a neat sketch. Discuss the phenomenon of Apodization. 7) Write a brief note on fibre optic materials. Obtain the expression for numerical aperture of an optical fibre. 8) Explain the basic optical laws and optical fibre modes. Distinguish between step index fibre and graded index fibre structures. 9) Answer any Two of the following : a) Reflection at normal incidence. b) Laser pumping. c) Applications of holography. d) Losses in optical fibre.
2 (DPHY22) M.Sc. (Final) DEGREE EXAMINATION, MAY 2013 () PHYSICS Paper - VI : Nuclear Physics, Molecular and Resonance Spectroscopy Answer any five questions 1) a) Write a note on characteristics of nuclear forces b) Describe the Meson theory of nuclear forces 2) a) Describe briefly the shell model of nucleus b) Derive the Weizacker semi empirical mass formula and discuss its significance 3) a) State and explain various kinds of nuclear reactions b) Write a note on pair production 4) a) Explain Gamow s theory of alpha decay b) Write the classification and properties of elementary particles 5) a) What is the basic principle of NMR? Explain spin-spin relaxation in NMR b) Derive block equations in NMR 6) a) Discuss the requirements of NQR spectroscopy b) Describe the working of NQR spectrometer with neat block diagram 7) a) Discuss about asymmetric top and spherical top molecules b) Describe the rotational spectra of rigid rotator 8) a) Write about vibrational energy levels of a simple harmonic oscillator b) Discuss about infrared spectroscopy 9) Write notes on any two of the following : a) Proton-Proton, proton-neutron shattering b) Fermi s theory of β-decay c) Spin relaxation time by pulse method d) Non-rigid rotator-energy levels
3 PHYSICS Paper - VII : Solid State Physics-I (DPHY23) Answer any five questions 1) a) With suitable examples, Explain what are point and space groups. b) What is meant by reciprocal lattice? Explain. 2) a) Explain Bragg s law. What are its applications. b) Explain the determination of lattice constants from X-ray diffraction patterns. 3) a) What are primary bonds and secondary bonds? Why they named so. b) Write the characteristics of primary and secondary bonds. 4) a) Derive the dispersion relation in diatomic lattice. b) What is Reststrahlen effect? How it is useful to ionic and covalent character of a crystals. 5) a) Explain Dulong and Petit s law of heat capacity. b) What is quantum theory of heat capacity? What are the draw backs of Einstein s theory. 6) a) Discuss the motion of electron in one dimensional periodic potential. b) How solids are classified basing on this theory. 7) a) Draw the band structures of intrinsic and extrinsic semiconductors. b) Derive the expression for carrier concentration in the valence band of intrinsic semiconductor. 8) a) What is Hall effect? Explain the theory of Hall effect. b) What is a p-n junction? Write different p-n junctions.
4 9) Write notes on any two of the following : a) Laue method of X-ray diffraction. b) What is a phonon? Write properties of phonons. c) Anharmonic effects. d) Thermoelectric effect.
5 Physics Paper - VIII : SOLID STATE PHYSICS - II (DPHY 24) Answer any Five questions 1) What is meant by local field in a solid dielectric? Deduce an expression for the local field for structures possessing cubic symmetry. 2) Give a brief account of Landan s theory of phase transitions in ferroelectric crystals. Distinguish between second order and order transitions. 3) Explain in detail the role of dislocations in crystal growth. 4) Describe with necessary theory and method of measuring the susceptibility of a paramagnetic substance. 5) Explain the different contributions for the formation of domains in a ferromagnetic material and show how the hysteresis curve is explained on the basis of the domain theory. 6) Give an account of Neel s theory of antiferromagnetism and show how the ferromagnetic behaviour of ferrites can be explained from Neel s theory. 7) Bring out the salient experimental features of superconductivity. Mention the important applications of superconductivity. 8) How are cooper pairs formed? Explain the BCS theory of superconductivity and discuss the energy gap based on this theory. 9) Write notes on any two of the following : a) Electrostriction. b) Effect of crystal field. c) Weiss theory of ferromagnetism. d) High temperature superconductors.
(DPHY 21) 1) a) Discuss the propagation of light in conducting surface. b) Discuss about the metallic reflection at oblique incidence.
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