Gauhati University Question Papers for Physics 6th Semester
Gauhati University Question Papers for Physics 6th Semester
Question Paper from 2010 available
More than 50 question papers every semester
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Paper 101
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Paper 102
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2010
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2011
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More than 50 question papers every semester
SIXTH SEMESTER
PAPER 601 (THEORY)
NUCLEAR PHYSICS:
1. Nuclear forces and Stability of Nuclei: Concept of packing fraction and binding energy, binding energy curve and its significance. Nucleon-nucleon forces – qualitative
discussions on nuclear force. Brief outline of Yukawas meson theory, Nuclear stability, neutron proton ratio in stable nuclei, stability curve, odd-even rules of nuclear stability.
2. Alpha decay: Cause of alpha decay, basic α-decay process, range and energy of α-decay,
α-decay systematics, Geiger Nuttle rules, Qualitative discussion on the theory of α-decay.
3. Beta-decay: Types of β-decays, conditions of β+ & β- decay and K capture, β-ray
spectrum, Pauli’s neutrino hypothesis.
4. Gamma-rays: γ-rays and their origin. Interaction of γ-particle with matter.
4. Gamma-rays: γ-rays and their origin. Interaction of γ-particle with matter.
5. Nuclear models: Evidence in favour of liquid properties of nuclei, Liquid drop model, Bethe-Weisackar’s mass formula. Applications of mass formula – estimation of fission
energy, prediction of most stable member of an isobaric family. Shell model (Basic
concepts only).
6. Nuclear Reactions: Types of nuclear reactions, conserved quantities of nuclear reaction, energies of nuclear reaction – Q-value & its experimental determination. Exoergic & endoergic reactions. Cross-section of nuclear reaction and its unit. Nuclear fission and
chain reaction, critical size, controlled chain reaction and basic principle of nuclear reactor. Nuclear fusion reaction – basic concepts of fusion reactions, fusion barrier, fusion
and thermonuclear reactions (PP chains only).
7. Accelerators: Necessity of charge particle acceleration – construction and working principle of linear accelerator. Construction and working principle of a cyclotron.
7. Accelerators: Necessity of charge particle acceleration – construction and working principle of linear accelerator. Construction and working principle of a cyclotron.
8. Detectors: Principles of detection of charge particles. Construction and working principle of gas filled detectors. Ionization chamber – its construction & working principle.
9. Cosmic rays: Origin of cosmic rays, primary & secondary cosmic rays and their composition. The East West effect. Latitude, longitude & altitude effect, Extensive Air
Shower (EAS).
PAPER: 602 (THEORY)
(a) MATHEMATICAL METHODS:
Introduction to tensor, transformation of coordinates, contravariant and covariant tensor, tensorial character of physical quantities, symmetric and antisymmetric tensors, kronecker delta. Rules for combination of tensors- addition, subtraction, outer multiplication, contractions and inner multiplications.
(b) SOLID STATE PHYSICS:
1. The idea of amorphous and crystalline solids, The crystal lattice and translation vectors, unit cell, types of crystal lattice, Miller indices, diffraction of X-rays, use of
Bragg’s law to the determination of lattice constants.
2. The different types of crystal bonding: ionic, covalent, metallic, Van der Waal and hydrogen bondings, cohesive energy of ionic crystal, Madelung constant.
3. Free electron theory of metals, Boltzmann’s equation of state, electronic specific heat, electrical and thermal conductivity of metals, Wiedemann-Franz law.(Quantum
Mecanical treatment to be used).Bloch theorem in one dimension, Kronig-Penny
model of energy bands of solids, distinction among metal, insulator and semiconductor, intrinsic and extrinsic semiconductors (qualitative discussion only).
4. Introductory concept of superconductivity, Meissner effect, types I and type II
superconductors.
5. Magnetic properties of solids: Magnetization, magnetic intensity, magnetic susceptibility, permeability, hysteresis, B-H curve and energy loss in hysteresis, different classes of magnetic material, magnetic moment, Bohr magneton, Larmor precession, Classical theory of paramagnetism(Langevin’s theory and Curie law),
Weiss theory(Quantum Mecanical treatment to be used), relation between para and ferromagnetism, Ferromagnetic domain.
PAPER: 603 (THEORY)
(a) MODERN OPTICS:
1. Optics of crystals: Wollaston prism, Rochon prism, Jones calculus, Interference of polarized light: interference due to crystal plates in plane polarised light, Babinet
compensator. Principle of liquid crystal display.
2. Lasers: Characteristics of laser light, absorption Spontaneous emission, Stimulated emission, Einstein coefficients, Population inversion and light amplification, Essential components of the laser, Ruby and He-Ne laser (principles only). Elementary idea about non-linear optics: Second Harmonic Generation.
3. Holography: Formation of a hologram, Reconstruction of the hologram
3. Holography: Formation of a hologram, Reconstruction of the hologram
(mathematical aspect).
4. Optical Fibers: Types of fibers; propagation of a ray through step index fiber: numerical aperture, multipath dispersion; propagation through graded index fiber. Basic idea about communication through an optical fiber cable (Block diagram).
5. Optical components & Spectrographs: Ramsden and Huygen’s eyepieces, oil immersion objective, Prism spectrograph (Glass and quartz), Grating spectrograph.
(b) ELECTROMAGNETIC THEORY:
1. Electromagnetic field equation in integral and differential form, displacement current, Maxwell's equations, Energy Conservation Law-Poynting theorem and
Poyntingvector.
2. Electromagnetic wave equation, velocity of electromagnetic wave, Monochromatic plane wave equation in free space and conducting medium. Reflection and Refraction of plane electromagnetic wave for normal and oblique incidence, Snell's
law, reflection and transmission co-efficient, Fresnel's equations, Polarisation of
electromagnetic wave, linear, circular and elliptical polarization, Brewster's law
PAPER: 604 (THEORY)
(a) STATISTICAL MECHANICS:
1. Statistical system, and its coordinates, specification of a state in statistical mechanics, Macrostate and microstate, phase space, ensemble, Boltzmann entropy relation, ergodic hypothesis, postulate of equal a priori probability, density of phase points in phase space, Liouville’ theorem.
2. Symmetry of wavefunction, restriction regarding the number of particles in given state, different types of statistics- Maxwell-Boltzmann(MB), Bose-Einstein(BE) and
Fermi-Dirac(FD) Statistics, Most probable distribution relation in MB, BE and FD
statistics and their comparison. Degeneracy Factor, Density of state.
3. Application of MB statistics to derive Maxwell distribution law (velocity, energy, momentum and frequency).
4. Fermi energy and Fermi temperature, Fermi distribution function, Application of FD
statistics to discuss electronic specific heat.
5. Application of BE statistics to explain BE condensation and to derive Black body radiation formula.
(b) COMPUTER APPLICATIONS:
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1. Programming exercise (either FORTRAN-95 or C or C
): simple mathematical
series generation and summation, sorting of numbers largest of n numbers, sorting a list ascending/descending order, solution of quadratic equation, solution of simultaneous linear equation, least square graph fitting (straight line and quadratic curve) of given data, iterative methods, implementation of Runge-Kutta 4th order
method of solving differential equation and Simpson's rule for integration.
30 Lectures
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