Archive for theoretical physics

Examination Time in Maynooth

Posted in The Universe and Stuff, Education, Maynooth, Barcelona with tags , , on May 17, 2024 by telescoper

Today ( Friday 17th May) is the first day of the Summer Examination Period in Maynooth. Although I’m not there right now I thought I’d take the opportunity to wish all students the best for their examinations:

You shouldn’t really be relying on luck of course, so here are some tips for the examination period (especially for physics students, but applicable elsewhere).

  1. Try to get a good night’s sleep before the examination and arrive in plenty of time before the start. Spending all night cramming is unlikely to help you do well.
  2. Prepare well in advance so you’re relaxed when the time comes.
  3. Read the entire paper before starting to answer any questions. In particular, make sure you are aware of any supplementary information, formulae, etc, given in the rubric or at the end.
  4. Start off by tackling the question you are most confident about answering, even if it’s not Question 1. This will help settle any nerves. You’re under no obligation to answer the questions in the order they are asked.
  5. Don’t rush! Students often lose marks by making careless errors. In particular, check all your numerical results on your calculator at least twice
  6. Please remember the units!
  7. Don’t panic! You’re not expected to answer everything perfectly. A first-class mark is anything over 70%, so don’t worry if there are bits you can’t do. If you get stuck on a part of a question, don’t waste too much time on it (especially if it’s just a few marks). Just leave it and move on. You can always come back to it later if you have time.

Meanwhile, in Barcelona, Monday is a public holiday (Pentecost) so I am faced with the prospect of having to endure a long weekend break. Such is life…

Branding Physics

Posted in Maynooth with tags , on July 9, 2023 by telescoper

How do you like the AI-generated image for new corporate branding of the Department of Theoretical Physics at Maynooth University?

I quite like it, as it accurately portrays the friendly and welcoming atmosphere of the Department, but it’s a bit misleading because the sinister-looking men in the picture are wearing ties.

After the Lectures, before the Examinations

Posted in Education, Maynooth, The Universe and Stuff with tags , , on May 11, 2023 by telescoper

This morning I did my last teaching session of the Academic Year 2022-3, a revision lecture/tutorial on Computational Physics. It was optional, as this is officially a study break, and was at 9am, but I had about 40% attendance which wasn’t bad in the circumstances. As is often the case with optional sessions, I think the students who came were the keenest and probably therefore those who least needed last-minute tips for the examination, but that’s always the way.

The Examination Period starts tomorrow, but most of the students who turned up this morning have their first examination on Monday. My paper is on Saturday next, 20th May.

Anyway, now that my teaching is over I thought I’d take the opportunity to wish all students the best for their examinations:

You shouldn’t really be relying on luck of course, so here are some tips (especially for physics students, but applicable elsewhere).

  1. Try to get a good night’s sleep before the examination and arrive in plenty of time before the start. Spending all night cramming is unlikely to help you do well.
  2. Prepare well in advance so you’re relaxed when the time comes.
  3. Read the entire paper before starting to answer any questions. In particular, make sure you are aware of any supplementary information, formulae, etc, given in the rubric or at the end.
  4. Start off by tackling the question you are most confident about answering, even if it’s not Question 1. This will help settle any nerves. You’re under no obligation to answer the questions in the order they are asked.
  5. Don’t rush! Students often lose marks by making careless errors. In particular, check all your numerical results on your calculator at least twice
  6. Please remember the units!
  7. Don’t panic! You’re not expected to answer everything perfectly. A first-class mark is anything over 70%, so don’t worry if there are bits you can’t do. If you get stuck on a part of a question, don’t waste too much time on it (especially if it’s just a few marks). Just leave it and move on. You can always come back to it later.

Newsflash – New MSc Course at Maynooth!

Posted in Education, mathematics, Maynooth with tags , , on April 8, 2023 by telescoper

I know it’s the Easter holiday weekend but I couldn’t resist sharing the exciting news that we have just received approval for a brand new Masters course at Maynooth University in Theoretical Physics & Mathematics. The new postgraduate course will be run jointly between the Departments of Theoretical Physics and Mathematics & Statistics, with each contributing about half the material. The duration is one calendar year (full-time) or two years (part-time) and consists of 90 credits in the European Credit Transfer System (ECTS). This will be split into 60 credits of taught material (split roughly 50-50 between Theoretical Physics and Mathematics) and a research project of 30 credits, supervised by a member of staff in a relevant area from either Department.

This new course is a kind of follow-up to the existing undergraduate BSc Theoretical Physics & Mathematics at Maynooth, also run jointly . We think the postgraduate course will appeal to many of the students on that programme who wish to continue their education to postgraduate level, though applications are very welcome from suitably qualified candidates elsewhere.

Although the idea of this course has been on the cards for quite a while, the pandemic and other issues delayed it until now. This has so recently been agreed that it doesn’t yet exist on the University admissions webpages. This blog post is therefore nothing more than a sneak preview. There isn’t much time between now and September, when the course runs for the first time, which is why I decided to put this advanced notice on here! I will give fuller details on how to apply when they are available. You will also find further information on the Department’s Twitter feed, so if you’re interested I suggest you give them a follow.

PhD Opportunity in Theoretical Astrophysics at Maynooth!

Posted in Maynooth, The Universe and Stuff with tags , , , on January 18, 2023 by telescoper

Posting this again because the deadline (31st January) is coming up fast….

The Department of Theoretical Physics at Maynooth University invites applications for a PhD in Theoretical Astrophysics starting in September 2023. The successful applicant will work in the group led by Dr. John Regan on a project examining the formation processes of massive black holes in the early Universe. Massive black holes populate the centres of all massive galaxies and are now also observed in both the centres and in off-centre locations in less massive dwarf galaxies.

For more details and instructions on how to apply, see here.

PhD Opportunity in Theoretical Astrophysics at Maynooth!

Posted in Maynooth, The Universe and Stuff with tags , , , on December 8, 2022 by telescoper

The Department of Theoretical Physics at Maynooth University invites applications for a PhD in Theoretical Astrophysics starting in September 2023. The successful applicant will work in the group led by Dr. John Regan on a project examining the formation processes of massive black holes in the early Universe. Massive black holes populate the centres of all massive galaxies and are now also observed in both the centres and in off-centre locations in less massive dwarf galaxies.

For more details and instructions on how to apply, see here.

A Question of the Past

Posted in Biographical, Cute Problems, Education, Maynooth, The Universe and Stuff with tags , , , , , on April 20, 2022 by telescoper

I was tidying up some old files earlier today and came across some old examination papers, including those I took for my final examinations in Part II of the Natural Sciences Tripos in 1985. There were six of these, in the space of three consecutive days…

I picked one of the questions to share here because it covers similar ground to my current (!) Advanced Electromagnetism module for final-year students in Maynooth. Sorry it’s a bit grubby!

It’s been a long time since I took my finals and I’d largely forgotten what the format was. The question above was taken from Paper II which consisted of nine questions altogether in three Sections, A (Solid State Physics), B (Statistical Physics) and C (Electromagnetism, from which Q9 above was taken; I think the course was actually called Electrodynamics & Relativity). The examination was 3 hours in duration and students were asked to answer four questions, including one from each Section. That means each question would be expected to take about 45 minutes.

Looking at the paper in general and the above question in particular, a number of things sprang to mind about differences between then in Cambridge and now in Maynooth:

  1. Our theoretical physics papers in Maynooth are 2 hours in duration in which time students are to answer four questions, so that the questions are a bit shorter – 30 minutes each rather than 45.
  2. Our papers are also on a single subject rather than a composite of several; we typically don’t offer the students choice; my Advanced Electromagnetism paper has four questions and students have to answer all four for full marks.
  3. The questions on the old Tripos papers are less structured. There is no indication of the marks allocated to each part of the question in the question above.
  4. As far as I can recall there was no formula booklet back in 1985, though there was a sheet of physical constants. My Advanced Electromagnetism examination this year comes with a couple of pages of useful formulae from vector calculus and key equations in EM theory. One might argue that the old Cambridge papers relied rather more on memory (especially when you take into account that everything was in the space of three days).
  5. Back to Question 9, it is true that this along with the other Electromagnetism questions is at a similar level to what I have been teaching this Semester. If I recall correctly the relevant course in Cambridge was of 24 lectures, the same length as the course I’m teaching this year.
  6. Students taking my course should know how to do both parts of Question 9 without too much difficulty.

On the final point, the easiest way to tackle this sort of problem is to do what the question says: determine the electric and magnetic potentials, derive the electric and magnetic fields from them, then work out the Poynting vector quantifying the energy flux. The part of this that survives in the far-field limit gives you the radiated power then – Bob’s your Uncle – the answer is basically the Larmor Formula which is ubiquitous in problems of this type. The case of an oscillating dipole is a standard derivation but this method works for any time-varying source, as long as you remember to include the retarded potentials if it’s not periodic.

Had I been writing this question for a modern exam I think I would at very least have ended the first part with “Show that the radiated power is…” and then given the formula, so that it could be used for the second part even if a student could not derive it.

A Day of Computing

Posted in Biographical, Education, Maynooth, The Universe and Stuff with tags , , , , , , on February 3, 2022 by telescoper

Last Semester, Thursday was what I optimistically called a “Research Day” (on the basis that I had no teaching on it). This Semester it’s one of my busiest teaching days, with lecturing in the morning and a lab session in the afternoon, both for Computational Physics.

For most of the last two years I’ve been delivering the lectures and running the lab remotely, but now that we’re back teaching face-to-face I gave the lecture in person and was in the lab with the class for this afternoon’s session. I’ve got about twice as many students this year as last year swill be running two lab sessions (one next Tuesday repeating the material from the Thursday one, and so on throughout the term).

Running the lab remotely worked reasonably well because Python is available to download for free and works on a standard Windows-based PC. In the lab however we use a Linux (Ubuntu) system, which gives the students the chance to try a different operating system (and one which is for many purposes better than Windows).

It’s good to be back running the computing laboratory class in person but I was a bit nervous this morning because since I last did it that way the machines we have in our laboratory have all been upgraded to a new operating system and have a new (and very different) version of Python (3.9 versus the now obsolete 2.7). I’ve been around long enough to realize that things can go wrong in such situations, so I warned the class during this morning’s lecture that there might be teething troubles. Sure enough we had quite a few technical glitches but, to be honest, it it could have been a lot worse. Next Tuesday’s lab should be a bit less stressful as we’ve fixed a few of the things that went wrong.

So, by no means a disaster, but a busy and quite stressful day. Time to go home and relax.

Boards of Examination

Posted in Biographical, Education, Maynooth with tags , , on June 11, 2021 by telescoper

We’ve at last staggered to the end of a week dominated by Examination matters. For myself that consisted of preliminary Examination Boards for Theoretical Physics and Engineering (for which we teach modules in Engineering Mathematics) followed by Final Examination Boards in both subjects with External Examiners present. Those final meetings both took place today so it’s been a particularly busy end of the week.

That’s not quite the end of the examinations business for the academic year, however, as we have the Final Final Examination Board in about ten days’ time. That is when marks from all Departments come together to determine the final results for students who are taking degrees in combinations of subjects. We have quite a number doing Joint Honours with Mathematics, for example. It does add an extra level to the process, but I think that’s a price worth paying for the flexibility we offer to students.

This final Examination Board takes place on 23rd June and students will get their marks a couple of days later on 25th June. Even that won’t be the end, because some students will be taking repeat examinations in August, but at least it signals a gap in the assessment cycle during which we can hopefully think of other things for a while.

Obviously I’m not going to comment on the marks for individual students but nobody will be surprised to hear that the Covid-19 pandemic has obviously had a big impact on some. It also had an impact on our External Examiner for Theoretical Physics who actually caught Covid-19 recently and became quite ill. Thankfully she is now feeling better and well enough to join us remotely today.

The Repeat Examination period takes place in August and will again be conducted remotely but hopefully the 1st Semester examinations next year will be under more normal circumstances. It’s not so much that I’m worried that our online examinations are somehow inappropriate, it’s just that it does take far longer to mark them than paper examinations and this year it has been extremely tight getting everything ready for the deadline by which marks must be committed to our central system (which is Monday 14th June).

Anyway, we’ve now done the job so I have an opportunity to thank all the staff in Theoretical Physics for their hard work and diligence!

Now it’s definitely wine o’clock.

Remote Exam Time Again

Posted in Education, Maynooth with tags , , , on May 14, 2021 by telescoper

It’s Friday 14th May 2021 which means that it’s the first day of the Summer examination period here in Maynooth, so let me begin by sending my best wishes to everyone taking examinations today and over the next few weeks, wherever you are. It’s a lovely morning in Maynooth. It seems to be a law of Nature that examinations always take place when the weather outside is nice.

For readers elsewhere in the world, full-time undergraduate students at Maynooth what is called 60 “credits” in a year, usually split into two semesters of thirty credits each. This is usually split into 5-credit modules with an examination in each module at the end of each semester. Projects, and other continuously-assessed work do not involve a written examination, but the system means that a typical student will have at least 5 written examination papers in January and at least another 5 in May.  This is very similar to the system in most UK universities that I am aware of except that a full year’s work over there is 120 credits so there’s a conversion factor of 2:1. A 5-credit module in Ireland would be a 10-credit module in the United Kingdom, for example, but otherwise the system is similar.

Each examination is usually of two hours’ duration. We’ve kept that length after moving examinations online, although students are given extra time to scan and upload their answers. The question papers themselves have been slightly adapted online use by having much less “bookwork”. Generally these assessments are unsupervised and students are allowed to consult notes and textbooks so there is little point in asking them to copy out standard derivations and formulae. That means we can concentrate on the problem-solving aspects of theoretical physics, which are the most interesting bits (and perhaps the most challenging).

One big difference between our examinations in Theoretical Physics in Maynooth and those at other institutions I’ve taught at in the UK is that most of the papers here offer no choice of questions to be answered. Elsewhere  it is quite common to find a choice of two or three questions from four or five on the paper.

One  advantage of our system is that it makes it much harder for students to question-spot in the hope that they can get a good grade by only revising a fraction of the syllabus. If they’re well designed, two long questions can cover quite a lot of the syllabus for a module, which they have to in order to test all the learning outcomes. To accomplish this, questions can be split into parts that may be linked to each other to a greater or lesser extent to explore the connections between different ideas, but also sufficiently separate that a student who can’t do one part can still have a go at others. With such a paper, however, it is a  dangerous strategy for a student to focus only on selected parts of the material in order to pass.

As an examiner, the Maynooth style of examination also has the advantage that you don’t have to worry too much if one question turns out to be harder than the others. That can matter if different students attempt different questions, but not if everyone has to do everything.

But it’s not just the number of questions that’s important, it’s the duration. I’ve never felt that it was even remotely sensible for undergraduate physics examinations to be a speed test, which was often the case when I was a student. Why the need for time pressure? It’s better to be correct than to be fast, I think. I always try to set examination questions that could be done inside two hours by a student who knew the material, including plenty of time for checking so that even a student who made a mistake would have time to correct it and get the right answer. If a student does poorly in this style of examination it will be because they haven’t prepared well enough rather than because they weren’t fast enough.

My first examination is this afternoon. The subject is (3rd Year) Computational Physics. This is an unusual module as a majority of the marks (60%) come from continuous assessment in the form of four class tests (20% altogether) and a mini-project (40%). The exam is a theory paper concerned with such topics as accuracy and stability. There are two questions on the paper, both of them compulsory. Next week there is my (4th year) Advanced Electromagnetism paper with four questions, again all compulsory. Obviously I’ll have to wait to see how the students do.

In the meantime here are some tips for students

  1. Try to get a good night’s sleep before the examination!
  2. Be ready well before the start and try to ensure you won’t be disturbed for the duration.
  3. If you’re doing an unsupervised examination, download the paper and any supplementary material needed  at the start to avoid problems if you get disconnected.
  4. Read the entire paper before starting to answer any questions. In particular, make sure you are aware of any supplementary information, formulae, etc, given in the rubric or at the end.
  5. Start off by tackling the question you are most confident about answering, even if it’s not Question 1. This will help settle any nerves.
  6. Don’t rush! Students often lose marks by making careless errors. Check all your numerical results on your calculator at least twice and remember to put the units!
  7. Show your working! Especially in an unsupervised examination you need to convince the examiner that you actually did the problem rather than looking up the answer on the net somewhere.
  8. Don’t panic! You’re not expected to answer everything perfectly. A first-class mark is anything over 70%, so don’t worry if there are bits you can’t do. If you get stuck on a part of a question, don’t waste too much time on it (especially if it’s just a few marks). Just leave it and move on. You can always come back to it later.
  9. Try to finish the paper at the assigned time, i.e. use the upload time for uploading rather than doing more work. There is always the chance that you might run out of time for upload if you’re rushing right at the end.
  10. If you’re scanning and uploading answers, check that you have submitted everything you intended to. I have had several examples of missing pages over the last year…

Anyway, once again, good luck and best wishes!