PHY 3101 - Modern Physics - Fall 2017


Announcements



Nov. 19 Homework: HW 10 and Bonus problems 5 are posted.

HITT info: HITT points through Friday, Nov. 17 are posted as well as HITT grades as calculated on the Course overview page.

Exam 3 time and format: The final exam is Thursday, Dec. 14 from 12:30 - 2:30pm, room to be announced. The format will be multiple choice this time.

Exam 3 topics: Topics include the material covered since exam 2 (electron shells in multielectron atoms, symmetrized and antisymmetrized wavefunctions, statistical distributions (MB, Fermi-Dirac, Bose-Einstein), nuclear physics, particle physics. Numerical problems will again be based on (somewhat modified) examples in my lecture notes, homework and HITT quizzes. Conceptual problems involving the main topics will come from anywhere in the lecture notes, homework and HITT quizzes.


Nov. 16 Exam 2 solution has been posted to e-Learning under Exam materials. Exams are all finished. Please check my addition! :-)

We will have a single, somewhat longer HW10 (due Dec. 4) rather than two assignments. I will also provide a shorter Bonus problem (due Dec. 6). Both will be available Monday, Nov. 20. The schedule page has been updated.


Nov. 13 Exam 2 scores have been uploaded to e-Learning (DRC exams not graded yet). The scores include 10 extra points with max score = 100. Exam 1 scores were adjusted by adding 11 points so that they are out of 100 points.

These adjustments boost scores somewhat and make it easier to calculate your two exam scores as part of your total grade (20 points apiece).


Nov. 3 Exam 2: A new summary document for exam 2 has been uploaded to Files-->Exam materials on e-Learning.

Exam 2 format: Exam 2 will contain (1) conceptual questions requiring 1-2 sentences at most and (2) quantitative problems to be solved. The quantitative problems will be taken (with small adjustments) from the examples in my notes, homework problems and quiz problems. All exam 2 material is covered in my notes. That gives you something finite to work with.

Exam 2 materials: You should bring a calculator, extra scrap paper and a single formula sheet filled out on both sides. I'll provide physics constants on the exam sheet, but you can also include them on your formula sheet.


Nov. 1 We will have a review for exam 2 on Friday, Nov. 3. The exam will cover quantum mechanics from the Bohr model through the second note on the hydrogen atom (including spin, which is covered in Chap. 8.1 of Harris). I will provide a short summary document of what's important to know.

Oct. 28 HITT points redux. I have decided to downgrade HITT problems where the correct responses are < 50% (i.e., everyone present gets 1 point). I modified all scores going back to the beginning of the semester (17 quiz questions were affected).

In addition, the calculation of total HITT points has changed from rawpoints/0.85 to rawpoints/0.80. (The calculation of your HITT grade is on the modified Course overview page). I really want to encourage people to come to class and do well on the clicker questions even when they are challenging.

A new version of the hydrogen atom lecture note (chap07A*.pdf) was uploaded with a new graph of the radial wavefunctions for n = 1, 2, 3 and a few other small changes.

A new version of the note on particle in a box (chap5C_*.pdf) was uploaded to fix an error that one of you caught in the description of the potential energy for the finite potential wall situation.


Oct. 27 Bonus problem 3 has been graded. Bonus problem 4 is due Monday. Always attach the cover page to your bonus problem output.

I am downgrading HITT problems where the correct % is < 40% (everyone gets 1 point).


Oct. 24 I uploaded a possible CAS solution using Sage for Bonus problem 3.1 (6th order coefficients of Adams-Bashforth method for solving 1st order differential equations). (Updated Oct. 26.)

Oct. 21 I uploaded a new version of Bonus problems 4 that improves wording and corrects some problems. Please download this version if you had downloaded it previously.

I uploaded a new version of the particle in a 3D box with an additional example (chap05F_*.pdf).

HW9 has been uploaded to e-Learning.

The latest HITT points have been uploaded to e-Learning. If you have a 0 for the points, it means that your clicker is not registered (clickers 647863 and 694066).


Oct. 18 I uploaded a new version of the Oct. 18 quiz solution that has a figure with side by side graphs of the finite box and infinite box wavefunctions that clearly show the difference in wavelengths. Similarly, I updated the particle in a box lecture note (chap05C_*.pdf) to include the same figure.

Bonus problems 4 uploaded to the Homework page.


Oct. 17 I uploaded an improved version of the lecture note on particle in a box (chap05C_SE_*.pdf). The plots are slightly improved, an error was corrected for the quantization condition for the finite potential well, an infinite well example was added, and an edit was made about symmetric/antisymmetric solutions to the finite potential well. We will continue discussing the quantum harmonic oscillator next lecture.

Oct. 16 LIGO, Virgo see gravitational waves from neutron star merger, confirmed by observations of simultaneous gamma ray photons! See LIGO website. and Science mag article

HW 8 has been uploaded to the website.

Very few people have gone over exam 1 with me. I am still willing to meet with groups of students to go over it.


Oct. 10 Exam 1 has been graded and grades uploaded to e-Learning.

Bonus problem 3.1 had an obvious typo (yi should be yj). It is now fixed.

I posted a Python program that solves bonus problem 2 for your perusal. It is in Files-->Some HW problems. I solved the equation using three different methods, the second of which (linear Newton method) is the one I asked you to code. The others are worse (successive approximations) or better (quadratic Newton method) than that approach.


Oct. 9 Exam 1 still being graded, but almost done. We agreed in class today that I would do an Exam 1 review Tuesday (Oct. 10) at 2:00pm and Wednesday at 7:00pm. I will try to identify locations Tuesday morning. Otherwise, please come to my office (2029 NPB) and we will find a room then.

Exam 2 date has been changed from Tuesday, Nov. 7 to Wednesday, Nov. 8 because of a conflict with another course. Same room, Flint 50, at 8:20pm. The schedule page has been updated. Please inform me of potential conflicts well in advance.


Oct. 6 Exam 1 solution has been uploaded to e-Learning under Files-->Exam materials. Let me know if you see any problems with it.

HW 7 has been uploaded to the homework page.


Oct. 4 I plan to grade exam 1 over the weekend (leaving town on Thursday and returning Sunday). I will post the solution under Files-->Exam materials.

I will edit the schedule page to bring it more up to date for the next few weeks as we begin our exploration of wavefunctions and quantum mechanics. New HW assignments and bonus problems will also be posted.

Since we have another conflict of the same course (EGM3344) with exam 2 on Tuesday, Nov. 7, I have requested a new date for that exam from the Registrar. Stay tuned.


Sep. 30 A new version of the Rutherford scattering lecture note (chap04A_*.pdf) with an important example has been uploaded.

HW 6 and Bonus problems 3 were uploaded to the homework page.

Bonus problems 1 & 2 have been graded and results uploaded to e-Learning. See me if you want a useful critique of your programs that will help your future efforts.

HITT points on e-Learning have been updated through Sep. 29.


Sep. 25 Exam 1: Exam 1 will cover Special Relativity through Rutherford scattering. It will not include the Bohr model, in spite of what I said in class.

Exam 1 format: The exam will contain (1) conceptual questions requiring 1-2 sentences at most and (2) quantitative problems to be solved. The quantitative problems will be taken (with small adjustments) from the examples in my notes, homework problems and quiz problems. All exam 1 material is covered in my notes. That gives you something finite to work with.

Exam 1 materials: You should bring a calculator, extra scrap paper and a single formula sheet filled out on both sides. I'll provide physics constants on the exam sheet, but you can also include them on your formula sheet.


Sep. 22 The note on Compton scattering (chap03E_*.pdf) was updated Wednesday afternoon and again this morning to include two examples.

Sep. 19 HW 5 and Bonus problems 2 have been uploaded to the homework page. Feel free to get help from me on the bonus problems if you are stuck.

Sep. 18 I uploaded a corrected version of the note on blackbody radiation (chap02C_*.pdf) to correct an error in the formula for total power emitted at the bottom of page 5 (8 → 2).

Sep. 17 I uploaded an improved version of the note on blackbody radiation (chap02C_*.pdf). The discussion of BB radiation in the textbook is extremely short and inadequate given its importance in the development of physics. Students should read and digest the information on BB radiation in the lecture notes, which include several examples.

I also uploaded an improved version of the lecture notes on the photoelectric effect (chap03D_*.pdf).

I plan to add material on the nuclear atom and the experiments that shaped our modern view of the atom. This material is not covered in the textbook but is extremely important. The lectures on this material will start immediately after we finish Chapter 3.

Homework 4 has just been posted and the due date is now Sep. 25 (Monday). Because of the delays caused by Hurricane Irma I also eliminated one HW so that they are not due so close together. Please see the updated schedule page. Bonus problem 2 will be uploaded later today with a reasonable due date.


Sep. 14 Please finish reading the entire note on relativistic kinematics (chap02F_*.pdf) even though we were not able to discuss all of it in lecture.

Because of the time lost due to Hurricane Irma, General Relativity will not be on any homework, quiz or exam. However, GR is hugely interesting, particularly with the announcements of the discovery of gravitational waves in 2016 and 2017. For those of you with a strong interest in the subject, I uploaded an updated GR lecture note (chap02G_*.pdf).

HW 3 is now due Wednesday, Sep. 20. The HW and schedule pages have both been updated. This homework covers only relativistic kinematics.

HW 4 (still to be created) has now been delayed to Friday, Sep. 22, to put a couple days between it and HW 3.

Important: Please send email only to phy3101 AT phys.ufl.edu. I need all class related email to be in one place.


Sep. 10 UF announced today (Sunday) that there will be no classes Wednesday, Sep. 13. We thus have no lectures for the dates Sep. 8 (F), Sep. 11 (M), Sep. 13 (W). I will announce later which topics we will either skip or have reduced coverage.

HW 2 is now due Friday, Sep. 15 (as is Bonus problem 1). HW 3 is still due Monday, Sep. 18 (will post the problems later). The HW and schedule pages have both been updated.

Hope everyone is able to be sheltered during this time. It's certainly the most interesting weather I've experinced in 32 years living in Florida.


Sep. 7 We will not have class Friday, Sep. 8, contrary to what I previously posted, since UF just announced it will be closed. UF is closed Monday, Sep. 11, so our first class next week will be Wednesday, Sep. 13

HW 2 is now due Wednesday, Sep. 13. HW 3 has been moved to Monday, Sep. 18.

HW problem 2.22 is worked out in detail on e-Learning under Files-->Some HW problems. I will use this area to post solutions to more complex or difficult problems.


Sep. 5 I updated note 5 on Special Relativity (chap02E_SR*) to e-Learning to improve the presentation and to address a question in class on Friday (Sep. 1).

I uploaded a new note 6 (chap02F_SR*) on relativistic kinematics to e-Learning.

Because of Hurricane Irma, Homework 2 due date is now Monday, Sep. 11.

HITT points through Friday, Sep. 1, have been uploaded to e-learning. If you have 0 points it means that your clicker is not registered. Please go to the HITT page to find out how to register your clicker.


Aug. 30 HITT quiz questions count for credit today!

I uploaded note 3 on Special Relativity (chap02C_SR*) again today to update the material on the Doppler effect.


Aug. 29 HITT quiz solutions for Aug. 25 and Aug. 28 have been uploaded to the Files-->Quiz solutions folder on e-Learning. I will keep this folder up to date after each quiz.

Aug. 28 I significantly edited the second Special Relativity note (chap02B_SR*.pdf in e-Learning). The new note uses a somewhat less formal approach to deriving the LT equations (putting some details in an appendix) and follows Harris a little more closely.

I edited the third Special Relativity note (chap02C_SR*.pdf in e-Learning) to add a section exploring violation of simultaneity, making it more complete.

In the lectures this week we explore consequences of the LT equations, including time dilation, length contraction, breakdown of simultaneity, velocity addition, doppler effect, invariant quantities and spacetime intervals. These are analyzed in the third relativity note.


Aug. 23 First day of lectures (see schedule page).

Remember that the material covered in lectures are in the "Files-->Lecture materials" folder on e-Learning. I will be lecturing from these rather extensive notes, which are probably easier to follow for the Relativity part of the course.

Here is a file with some of my pictures from the Aug. 21 solar eclipse.


Aug. 21 Welcome to PHY3101! As I indicated in the course announcement on e-Learning and by email, we will not have lecture on this day (Aug. 21), but I expect you to read all the course syllabus material during this time so that we can begin in earnest on Wednesday, Aug. 23. Please note the following points.
  • Read the Course overview page, which describes important aspects of the course, including lecture location/time, material covered, textbook, grading components, how we use e-Learning, test accommodations, etc.
  • Read the Programming page to learn about the programming tools you will learn in this course.
  • We will use HITT clickers as we did in Physics 1 and Physics 2. Please purchase a clicker if you do not have one already. You will need to register the clicker for this course as described on HITT page.
  • The class schedule shows the lecture schedule, exam dates, and on-line homework due dates.
  • Please read Chapters 1 and 2.1-2.2. I have also placed some introductory materials on e-Learning under "Files-->Lecture materials", including a useful review of Physics 1&2, approximation formulas, basic formulas used in phy3101, and the first two notes on Special Relativity.
  • VERY IMPORTANT: Class email should always be addressed to phy3101 AT phys.ufl.edu and not to my home account. I want to keep class correspondence in a single area that is easy for me to find.