(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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1 (DPHY 21) ASSIGNMENT - 1, MAY PAPER- V : ELECTROMAGNETIC THEORY AND MODERN OPTICS 1) a) Discuss the propagation of light in conducting surface. b) Discuss about the metallic reflection at oblique incidence. 2) a) How do you demonstrate the anomalous dispersion experimentally. b) Discuss the theory of dispersion. 3) a) What is a three level lasing system? b) Explain the principle and working of Ruby laser. 4) a) What is meant by coherence? b) Explain the principle and working of CO 2 laser. 5) Answer any two of the following: a) Total internal reflection. b) He-Nelaser.
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3 (DPHY 21) ASSIGNMENT - 2, MAY PAPER- V : ELECTROMAGNETIC THEORY AND MODERN OPTICS 1) a) Explain the working of a hologram with a neat sketch. b) Explain fresnel and fourier transform holography. 2) a) Write a brief note on fibre optic materials. b) Obtain the expression for numerical aperture of a optical fibre. 3) a) What is step index fibre? b) Give the mode theory for circular wave guides. 4) a) What are optical fibre materials? Explain briefly. b) Explain various fibre fabrication methods. 5) Answer any two of the following: a) Principle of holography. b) Losses in optical fibres.
4 (DPHY 22) ASSIGNMENT - 1, MAY PAPER-VI: NUCLEAR, MOLECULAR AND RESONANCE SPECTROSCOPY 1) a) Explain in detail about the meson theory of nuclear forces. b) Derive the semi empirical mass formula. 2) a) Explain general characteristics of nuclear forces. b) Derive the energy expressions related to proton-proton scattering. 3) a) What are the various conservation laws in nuclear reactions? b) Derive the Q-equation in nuclear reactions. 4) a) Explain about fermis theory of -decay. b) What are various selection rules in -decay. 5) Write a notes on any two of the following: a) Liquid drop model. b) Internal conversion.
5 ASSIGNMENT - 2, MAY (DPHY 22) PAPER-VI: NUCLEAR, MOLECULAR AND RESONANCE SPECTROSCOPY 1) a) Briefly Explain about the NMR theory. b) What are spin-lattice and spin-spin relaxation times? 2) a) What are the fundamental requirements of NQR spectroscopy. b) Give the experimental details of NQR spectrometer. 3) a) Derive the energy levels of a diatomic molecule behaving as rigid and non-rigid rotator. b) What are the selection rules of rotation spectra. 4) a) What are P,Q,R branches? b) Explain the details of experimental techniques of IR spectroscopy. 5) Write a notes on any two of the following: a) Integral and half integral spins. d) Types of molecules.
6 (DPHY 23) ASSIGNMENT - 1, MAY PAPER- VII : SOLID STATE I 1) a) Define unit cell and primitive cell. Discuss different symmetry operations applied to crystals. b) Write the importance of reciprocal lattice in determining the crystal structure. 2) a) What is Bragg s law? Explain its importance in determining the crystal structure. b) Discuss the analysis of X-ray diffraction pattern in determining the lattice constants. 3) a) What are primary and secondary bonds? Write its properties. b) Derive the dispersion relation of monoatomic one dimension infinite lattice. 4) a) Derive the dispersion relation of diatomic one dimension infinite lattice. b) Write the properties of phonons. 5) Write note on any two of the following : a) Point groups and space groups. b) General theory of harmonic approximation.
7 (DPHY 23) ASSIGNMENT - 2, MAY PAPER- VII : SOLID STATE I 1) a) Discuss Dulong and Petit s law of specific heat and explain its draw backs. b) Discuss the quantum theory of heat capacity. 2) Discuss the motion of electron in one dimension lattice kronig-penney model and explain how the solids can be classified based on this model. 3) a) Draw the band structures of intrinsic and extrinsic semiconductors. b) Derive the expression for the carrier concentration in n-type extrinsic semiconductor. 4) a) State and explain Hall effect. b) Discuss the formation of p-n junction and give some examples for p-n junction devices. 5) Write note on any two of the following : a) Einstein theory of specific heat. b) Magneto resistance.
8 (DPHY 24) ASSIGNMENT - 1, MAY PAPER- VIII : SOLID STATE II 1) What is meant by local field in a solid dielectric. Discuss the electric field versus polarization curve in dielectrics and ferroelectrics. 2) Discuss the thermodynamic theory of ferroelectric transitions. Write about ferroelectric domains. 3) Write about different imperfections in crystals. Discuss the role of grain boundaries in crystals. 4) Write the quantum theory of magnetic susceptability. Describe Vanvlek paramagnetism. 5) Write a note on any two of the following : a) Classification of Ferroelectrics. b) Dislocations in crystal growth.
9 (DPHY 24) ASSIGNMENT - 2, MAY PAPER- VIII : SOLID STATE II 1) Write about exchange interaction and describe the Heisenberg model of ferromagnetism. 2) Describe the Neel model of ferrimagnetism. Write about ferrites and its applications. 3) Describe the BCS theory of super conductors and its important predictions. 4) Write the Ginzburg Landau theory of high temperature superconductors. List the few important superconductors. 5) Write a note on any two of the following : a) Spin waves. b) BCS theory.
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