This document provides information about a physics course at Matrusri Engineering College. It includes the course name, faculty name, topics to be covered, course objectives, and outcomes. The topics include crystal structures, band theory, semiconductors, dielectrics, and applications of lasers and optical fibers. One unit focuses on band theory of solids, classifying semiconductors, and transport phenomena. Another module discusses the classical free electron theory, its development, assumptions, and failures in explaining various solid state phenomena. It also provides a quiz on classical free electron theory.

1. MATRUSRI ENGINEERING COLLEGE
DEPARTMENT OF COMPUTER SCIENCE AND ENGINEERING
SUBJECT NAME: PHYSICS
FACULTY NAME: Dr. M. SREE LATHA

2. Engineering Physics
To understand the knowledge of structures of different solids
and analysis of crystal structure by diffraction techniques.
To explain the behavior of matter particles using wave
mechanics &basics of EM theory.
To understand the knowledge of the band structure of solids
and classification of solids on the basis of band theory.
To understand the properties of semiconductors,
superconductors, dielectric and magnetic materials.
Course Objectives :

3. Discuss fundamentals of crystal structures, structure analysis
techniques and crystal defects.
Interpret concepts of band theory, semiconductors and
polarizations of dielectrics.
Apply the knowledge of wave mechanics and electromagnetic
theory in engineering and technology.
Explain magnetic materials and superconductors.
Describe working of Lasers, Optial fibers and their
applications.
Course Outcomes :

4. UNIT-II
Band Theory of Solids, Semiconductors
&
Dielectrics
 Distinguish materials based on band theory of solids
Classify semiconductors on the basis of doping and to
estimate conductivity and learn transport phenomenon in
semiconductors
Out Comes of the Unit :

5. MODULE-I
Classical Free – Electron Theory
This module will help to understand the classical free electron theory, its
merits and demerits.

6. The electron theory of solids aims to explain the structures and
properties of solids through their electronic structure.
The electron theory of solids has been developed in three main
stages.
(i)The Classical free electron theory: Drude and Lorentz
developed this theory in 1900. According to this theory, the
metals containing free electrons obey the laws of classical
mechanics.
(ii)The Quantum free electron theory: Sommerfeld developed
this theory during 1928. According to this theory, the free
electrons obey Quantum laws.

7. (iii) Bloch stated this theory in 1928. According to this theory,
the free electrons move in a periodic field provided by the
lattice. This theory is also called Band theory of solids.

9. Drude model electrons (shown here in blue) constantly
bounce between heavier, stationary crystal ions
(shown in red).

11. Failure of classical free electron theory:
The electrical conductivity of semiconductor and insulator
cannot be explained by this theory.
 The concept of photo - electric effect, Compton effect and
black body radiation cannot be explained on the basis of this
theory
 The ferro-magnetism cannot be explained by this theory.
It fails to account the facts such as specific heat, temperature
dependence of conductivity and dependence of electrical
conductivity on electron concentration.

12. QUIZ
1) The Classical free electron theory proposed by _______ [ ]
(a) Drude (b) Lorentz (c) a & b (d) None
2) Classical free electron theory failed to explain___________ [ ]
(a) Formation of bands (b) optical properties of metals
(c) Wiedemann franz law (d) b & c
3) Classical free electron theory explained___________ [ ]
(a) Formation of bands (b) optical properties of metals
(c) Wiedemann franz law (d) b & c
4) Classical free electron theory obeys_______________ [ ]
a) Maxwell law b) Bose-Einstein distribution law
c) Fermi-Dirac distribution law d) Maxwell-Boltzmann distribution law
5) Classical free electron theory failed to explain___________ [ ]
a) Photo - electric effect, b)Compton effect
c) Black body radiation d) None

13. Questions
1. Discuss the merits and demerits of Free electron theory ?
2. Write the postulates of the Free electron theory ?