University of Lagos, Nigeria , PHS 304, Modern Physics II

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Title:

PHS 304, Modern Physics II

Institution:

University of Lagos, Nigeria

Level:

Degree.

Description:

Waves and Particles: Wave-particle duality of light: Photoelectric effects, Compton scattering, pair-production, Pair-annihilation etc.
Wave-Particle Duality of Matter: Experimental evidence: Davisson and Germer experiment for slow electrons (interpretation of results), Thomson's experiment for fast electrons (interpretation of results), experiments of stern and Estermann on the molecular beams of Hydrogen and Helium defracting from Lithium Fluoride Crystals.

The De Broglie Wavelength for moving particles. Wave packets, wave groups and guard waves. Group- and phase-velocities, relation to particle velocities. Introduction to wave mechanics, physical significance of wave-functions. Heisenberg uncertainty principle: the double-slit experiment.

Quantisation: Standing waves in strings as examples of quantisation. The size of an energy quantum of e.m. radiation. Bohr's quantisation postiletes i.e. stationary states and energy levels in Hydrogen and Hydrogen-like atoms (considering the motion of the Nucleus). Quantisation of Circular and elliptical orbits: Wilson-Sommerfield quantisation and the concept of equivalent orbits. The four essential quantum numbers. The Paulis exclusion principle and its consequences, the periodic classification of elements. Degeneracies of atomic states and their removals.

Atomic Spectroscopy: The Hydrogen Spectrum. Multiplicity of spectral lines and state degeneracies. The many-electron atoms, representation of electronic states in the atom, the atomic configuration. Atomic transitions, the selection rules. The j-j and L-S wuplings. Screening effects in many electron atoms.

Magnetic Properties of Orbits: Magnetic moments of atoms, the Bohr magneton. The Stern-Gerlech experiment and interpretation of results (space quatisation of atomic orbits in magnetic fields). The spinning electron. Mechanical vector model and the spin-orbit splitting. The normal and anomatons Zeemann Effects, and Larmour's recession. The Lande's g-factor. The Paschen back effect.

Magnetic Properties of Atoms: Dia-, para-, and ferro-magnetism. Langevin's theory of paramagnetism in paramagnetic gas. Quantum conditions in orientation of magnetic moment axes of atoms in a magnetic field and effects in Langevin's theory. Modification of Langevin's theory by Weiss. The Curie's law.

Ionisation and Excitation: Ionisation and excitation potentials: the Franck and Hertz experiment (interpretation of results). Ionisation by electron and positive ion elastic impacts, cross-sections and ionisation currents, charge exchange and recombination.

Radioactivity: Review of the fundamentals of radioactivity. Industrial, medical, and agricultural applications of radio-isotopes. X- decay and Geiger-Nutall's law. The B - decay and the nutrino hypothesis. Radiation units and radiation hazards.

Assessment is by assignments and examination.

Prerequisite: PHS 204.

Programmes for which this course is required or in which it can be included:
Bachelor of Science Honours in Education/Physics.

Languages:

English

Media and methods employed: Printed text, tV broadcast, radio broadcasts, face-to-face tutorials.

Printed correspondence texts prepared by institution, face-to-face tuition, radio, television via cable.

Administrative information:

This course is equivalent to 2 hours of instruction per week. It is a 1 semester course (15 weeks) and awards 2 units.

Classification:

070430 PHYSICS

Date:

01 September 1992 bb
Source: COSIT Brochure

[About the Institution][Courses][Programmes]

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