Modern Physics Teaching Spring2013

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Contents


Modern Physics (with thermodynamics)

Instructor: Dr. [Sabieh Anwar] Office hours: Tuesday and Thursday, (11:15 am to 1 pm). Recitation instructors are Dr. [Ata-ul-Haq] and Dr. [Imran Younus].

Teaching Instructors: [Shama Rashid],[Mudassir Moosa], [Syeda Qurrat-ul-Ain Akbar], [Maryam Khaqan], [Faran Irshad], [Hasnain Ali Pirzada]. Office hours and tutorial schedule is here.

Textbooks: Modern Physics by R.A. Serway, C.J. Moses and C.A. Moyer (also available in low priced edition.)

Course outline: Click here for the course outline.

Previous offerings: Here is the weblink for the same course I taught in Fall 2009. You will find homeworks, exams and their solutions from the 2009 offering of this course here, all in a consolidated pdf. Errors and omissions are expected. And here is the weblink for the offering in 2011 with all the video recordings.


Pre-mid term

Most important experiment in physics (1 lecture)

  • Double-slit experiment with bullets, waves and electrons
  • Spying on the electron to obtain "which-way" information erases the interference pattern
  • Reading material: Quantum behavior from Vol.3 of Feynman's Lecture Notes on Physics.

Internal energy and its quantization (9 lectures)

Visit the demonstrations page for links to demos shown in class.
Visit the demonstrations page for links to demos shown in class.
Field emission - glowing tube light in high tension
Field emission - glowing tube light in high tension
  • harmonic oscillator
  • concept of internal energy
  • thermal energy and temperature
  • first law of thermodynamics
  • internal energy is quantized
  • Line and continuous spectra
  • Quantization of vibrational levels and role of temperature
  • Quantization of rotational levels and microwave heating
  • Excitation by electron impact - Franck-Hertz experiment
  • Boltzmann factor


Recitation, tutorial material and reading suggestions:

  • Recitation 1.1: deals with the solution of second order differential equations
  • Recitation 1.2: dealing wiith quantized levels and first law of thermodynamics
  • Tutorial 1.1: on energy quantization and Boltzmann factor
  • Recitation 1.3: on energy loss, rotational and vibrational spectroscopy
  • Physics for Scientists and Engineers, by Serway and Jewett, Sections: 20.1, 20.4, 20.5, 20.6, 21.4, 21.5, 221., 22.3, 22.6, 22.7, 22.8. This reading material has been uploaded to LMS.




Note: Microsoft Silverlight (a freeware) is required to view the videos.

Video recordings:

Introducing internal energy: [1]

First law of thermodynamics and concept of the photon: [2]

Quantized energy levels and demonstrations on spectroscopy: [3]

Emission and absorption of photons, quantum harmonic oscillator: [4]

Franck-Hertz, micro-lightning, rotational and vibrational levels (part A): [5]

part B: [6]


Boltzmann distribution: [7]


Second law of thermodynamics (4 lectures)

Entropy can be created.
Entropy can be created.
  • microstates and macrostates
  • fundamental premises of statistical mechanics: all microstates are equally probable
  • distribution of energy in solids
  • entropy and the second law of thermodynamics
  • alternative meaning of temperature
  • examples

Recitation, tutorial material and reading suggestions:

Homework 1: (on thermodynamics)

Video recordings:

Macrostates, microstates and distribution of energies: [8]

Entropy and second law of thermodynamics: [9]

Entropy and temperature: [10]

Wrapping it up: energy, entropy, temperature and its computation: [11]


Modern version of J.J. Thomson's experiment
Modern version of J.J. Thomson's experiment
Particle description of matter (3 lectures)
  • Concept of the atom
  • Electrolysis and quantization of charge
  • Thomson's discovery of the electron
  • Rutherford's nucleus
  • Bohr's atom
  • Read Ch 4 of Serway's Modern Physics book.
  • Tutorial 3.1: on atomic structure
  • Recitation 3.1: on Bohr's model and more aspects of energy level transitions.
  • Homework 2: (on particulate nature of matter)
  • Download the homework. Deadline is Friday 15 March, 10 am 2013.
Wavelike nature of radiation (3 lectures)



Video recordings:

Atom and discovery of the electron: [12]

Modern version of Thomson's experiment and Rutherford's nucleus [13]

Bohr's ideas [14]

What are waves [15].

Building wavepackets (part A) [16]

Building wavepackets and Fourier inetgral(part B) [17]

Phase and group velocity, dispersion and demos on diffraction [18]


Particle description of radiation (4 lectures)
  • Photoelectric effect
  • X-rays and X-ray fluorescence
  • Compton effect
  • Positron emission tomography
  • Read Ch 3 of Serway's Modern Physics book.
  • For characteristic X-rays, you may also read Section 9.7 of Serway's book.
  • Here is my presentation on some interesting signposts in the history of X-rays.
  • Recitation 3.3: on the Compton Effect.
X-ray fluorescence and Moseley's law
X-ray fluorescence and Moseley's law
Spectrum of steel was shown in class.
Spectrum of steel was shown in class.

Video recordings:

Problems with a classical description of the photoelectric effect: [19]

Describing the photoelectric effect and X-rays: [20]

One video lecture is not available, due to a technical fault.

Compton Effect: [21]




Post-mid term

Matter waves and wave particle duality (10 lectures)

Electrons are in fact diffracted
Electrons are in fact diffracted
  • Nature of photon? particle or wave?
  • What is meant by a "particle" or a "wave"
  • Are photons affected by gravity
  • De Broglie's relationship
  • Electron diffraction, Davisson and Germer's experiment
  • Pilot waves and concept of wavefunction
  • Uncertainty principle and some of its applications
  • Energy-time uncertainty, lifetimes of excited states


Recitation, tutorial material and reading suggestions:

The neon tube producing its characteristic orange-red glow.
The neon tube producing its characteristic orange-red glow.


Video recordings:

The photon has momentum [22]

Double slit experiment with an electron and wave-particle duality (part A) [23]

Double slit experiment with an electron and wave-particle duality (part B) [24]

Introducing the wave function and meaning of wave-particle duality [25]

Meaning of superposition, example of delayed choice interference, collapse [26]

Demystifying the uncertainty principle (part A) [27]

Demystifying the uncertainty principle (part B) [28]

Demystifying the uncertainty principle and demonstration on linewidths (part C) [29]

Demystifying the uncertainty principle (part D) [30]


Homework 3: (on Wavefunctions, collapse and experimenting with beamsplitters)


Schrodinger equation applied to simple cases (7 lectures)

Visit the demonstrations page for links to demos shown in class.
Visit the demonstrations page for links to demos shown in class.
  • Introducing the Schrodinger equation
  • Potential well, bound and free states
  • Bouncing quantum atoms, atom optics
  • Fluorescence emission from quantum dots
  • Tunneling and some of its applications
  • Quantum obstacles, barriers
  • Nuclear radioactivity, field emission displays, scanning tunnelling microscopes
  • Read Chapter 6 and 7 of Serway

Recitation, tutorial material and reading suggestions:

Video recordings:

Confining electrons to Bohrs radii, orbitals and introducing the Schrodinger equation [31]

Potential in a well and fluorescence from quantum dots [32]

Learning some aspects of quantum mechanics using the particle in a well [33]

Time dependence of stationary states, what does a stationary state really mean and its relationship with the uncertainty principle [34]

Time dependence of superposition states, what does a superposition state signify [35]

Quantum obstacles and sloping potential wells [36]

Quantum mechanical tunneling [37]


Quantum technologies (4 lectures)

  • Scanning tunneling microscope
  • Phonon assisted tunneling and quantum physics of smell
  • Flash memory and field-effect transistors (of the MOSFET kind)
  • Natural radioactivity
  • Single electron transistors
  • Lasers, superconductors

Reading suggestions:

Video recordings:

Scanning tunneling microscopy, alpha decay and world's smallest movie [38]

Quantum sniffing, phonons, and properties of capacitors [39]

The quantum revolution in electronics and single electron transistors [40]

Interfering photons and electrons [41]e


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