PH102, 2012W, Lecture Notes: March 7, Wed, Class 21
Radioactive decay:
Definition: An unstable nucleus (parent nucleus) can spontaneously emit small particles or
energies to become a nucleus (daughter nucleus) in a more stable state.
Energy is conserved

PH102, 2012W, Lecture Notes: March 12, Mon, Class 23
Elementary particles and fundamental forces
In the modern view of physics, a fundamental force between particles is defined as an exchange
of a mediating particle that is specific to that force. Some ex

PH102, 2012W, Lecture Notes: February 15, Wed, Class 15
Molecules have three different energy sources:
Energy levels electrons occupy in their molecular orbitals
Rotations at the order of 0.001 eV
Vibrations at the order of 0.1 eV
Consider a diatomic m

PH102, 2012W, Lecture Notes: March 5, Mon, Class 20
Nuclear Physics: Nuclear Shell Model
The Liquid Drop model can predict the nuclear binding energy reasonably well. The Liquid Drop
model is based on the Strong Force between two adjacent nucleons in a nu

PH102, 2012W, Lecture Notes: March 2, Fri, Class 19
Nuclear Physics: Nuclear Structure, Properties, and Models
.
Structure of Nuclei
Nuclei consist of nucleons, i.e. protons and neutrons.
Z= number of protons
N= number of neutrons
A=mass number=total n

PH102, 2012W, Lecture Notes: February 17, Fri, Class 16
Energy Bands
The shape of wave
functions for a 4 atom
crystal is similar to that
of one single atom large
well, but four energy
states of the large single
well are grouped into an
energy band in a 4

PH102, 2012W, Lecture Notes: February 22, Wed, Class 17
Conduction-Valence Band Gap
As shown in the Figure above, at T=0, there are no electrons in the conduction bands of
insulators and semiconductors. The gap between conduction and valence band is much

PH102, 2012W, Lecture Notes: February 8, Wed, Class 12
What counts as quantum gases?
Lets consider a system of N particles in a 3-D box where the energy of each particle is defined
by three quantum numbers
.
The 3D Box
=
Note that E is dependent upon thre

PH102, 2012W, Lecture Notes: March 9, Fri, Class 22
Nuclear Reactions refer to any occurrences in which nucleons are changed or exchanged
between nuclei. Radioactive decay is a spontaneous nuclear reaction. Nuclear reactions can be
induced by striking a n

Lecture Notes: January 18, Wed, Class 4
Hydrogen Atom Models and Spectral Lines
Objectives:
(Cont.) Express the time-independent Schrodinger Equation for a particle in a 3dimensional infinite well situation using (x, y, z) coordinates. Describe quantized

PH102, 2012W, Lecture Notes: February 3, Fri, Class 11
Statistical Mechanics: Classical-Boltzman Distribution
Statistical mechanics:
concerns making predictions about properties and behaviors in systems where the number
of particles is huge, at the order

PHY102 Final Exam 1
PHY 102 Modern Physics Final Exam
Date: March 22, 2013
Name: _
1. Field quanta (12 points)
The Klein-Gordon equation below can be used to describe wave functions of mediating particles
involved in fundamental forces such as residual st

Lecture 18
Superconductivity
2/24/2012
Phys-102, G.-H. (Sam) Gweon, H.-S. Lee Class
1
Superconductivity
Perfect diamagnetism
Perfect conductivity
2/24/2012
Phys-102, G.-H. (Sam) Gweon, H.-S. Lee Class
2
What we will learn
Diamagnetic character
Microscop

PH102, 2012W, Lecture Notes: March 14, Wed, Class 24
Many particles produced at accelerators are unstable (except proton) and thus decay very
quickly. Basically, the study of elementary particles is the study of decay during strong,
electromagnetic, and w

PH102: 2012W 1
Lee, H. S.
Lecture Notes: January 13, Fri, Class 3
Schrodinger Equation Expressions for a Particle in 1-D Finite and 1-D Infinite Potential
Wells and 3-D Infinite Potential Well
Objectives:
Write Schrodinger Equations for bound states such

PH102, 2012W, Lecture Notes: January 30, Mon, Class 9
Angular Momentum in External Magnetic Fields
An electron revolving around a nucleus in an atom has two types of angular momentum:
Orbital angular momentum:
Spin angular momentum:
In the presence of an

PH102, 2012W, Lecture Notes: February 13, Mon, Class 14
Molecular Bonding
It is impossible to solve the Schrodinger equation for multi-atom bonding cases.
Approximations and qualitative judgments that agree with experimental results are
needed to approac

PH102: Modern Physics Homework 6 Solution
1. (20 points) Textbook: Harris, Chapter 12 Exercises #14
Klein-Gordon Equation:
Schrodinger Equation:
(a) Show that
equations.
Since
is a solution of both the Klein-Gordon and the Schrodinger
and
The right hand s

PHY102 Midterm Exam 1
PHY 102 Modern Physics Mid-Term Exam I
Date: February 1, 2012
Name: _
1. Determine whether Hamiltonian of the particles listed below are translationally and/or rotationally
invariant and explain why. Based on this information, determ

PH102: Modern Physics Homework 4 (Due: 2/27/2012)
1. (5 points) Textbook: Harris, Chapter 10 Conceptual Question #7
For the four kinds of crystal binding-covalent, ionic, metallic, and molecular-how would the
density of valence electrons vary throughout t

PH102 Homework 1 (Due: 1/20/2012)
1. Consider a free wave function
with being a real number.
(a) Show that this wave function is not normalizable.
(b) Discuss how this problem can be fixed by considering
(i) (Required) the fact that the space is not reall

PH102: Modern Physics Homework 5 Solution
1. (5 points) Textbook: Harris, Chapter 11 Conceptual Question #5
The semiempirical binding energy formula has four terms. Suppose we have a nucleus with 19
protons and 22 neutrons. For each term in the formula, i

PHY102 Midterm Exam II 1
PHY 102 Modern Physics Mid-Term Exam II
Date: February 29, 2012
Name: _
1. Electrons occupying diatomic molecular energy states (11 points total)
(a) (2 points per diagram) On diatomic molecular orbital energy levels drawn below,

PHY102 Final Exam 1
PHY 102 Modern Physics Final Exam
Date: March 16, 2012
Name: _
1. Klein-Gordon Equation (10 points)
The Klein-Gordon equation shown below is a relativistic wave equation that describes mediating
particles involved in fundamental forces

PH102: Modern Physics Homework 2 (Due: 1/30/2012) with Hints
1. (20 points) Textbook: Harris, Chapter 7 Conceptual Question #7
Mathematically, equation (7.22) is the same differential equation as we had for a particle in a
box-the function and its second