Two previous posts covered uncertainties in the context of thermal energy transfers but now we need to consider random and systematic errors as they apply more generally in the current AQA A-Level Physics course. NOTE: The AQA A-Level Physics syllabus takes a simplified approach to uncertainties so if you are doing independent revision you may … Continue reading Random and Systematic Errors
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How to read a micrometer
Being able to take measurements using common items of instrumentation is an expected skill for A-Level Physics and can be tested in examinations using diagrams or photographs. This post is the first in a short series that will look at measurement skills, starting with a piece of equipment that often causes difficulties; the micrometer. To … Continue reading How to read a micrometer
Am I dumber than a machine?
Help! I have been working my way through a series of puzzles designed to evaluate artificial intelligence systems by setting tasks that are supposed to be easy for humans to solve but hard for current AI engines to crack. All was going well until I came across one particular puzzle. I simply can't work out … Continue reading Am I dumber than a machine?
Paper 3a, Q3 walk-through
This post completes an explanation given to my current Y13 students, which was unfinished at the end of our lesson. It relates to the second half of Q3 in Paper 3a for the AQA A-Level Physics examination of June 2023. You can download a copy of the complete paper here. To solve Q3.4 you must … Continue reading Paper 3a, Q3 walk-through
Effective Revision
The following information is specifically for the benefit of my students who are studying the AQA A-Level Physics course, 7408, for examination this summer (2025). That said, the principles of revision are well known and apply much the same to every subject at every level. With that in mind, here are my top six tips. … Continue reading Effective Revision
How reliable are AI assistants?
To explore the current state of AI reliability in a physics context, two questions were put to five free AI assistants, all available via https://duck.ai/; Why don’t radioactive decay chains end with iron? Which isotope has the highest binding energy? Before revealing the AI responses, here are my own answers. Question 1 assumes that all … Continue reading How reliable are AI assistants?
Particle Physics (IYQ 2025)
Despite 2025 being designated the International Year of Quantum Science and Technology (IYQ) we still know surprisingly little about how quantum effects “work”. According to this year’s anniversary, the quantum story started in 1925 when Werner Heisenberg formulated his matrix mechanics while spending time on the German island of Helgoland. But Heisenberg was not the … Continue reading Particle Physics (IYQ 2025)
How to Use Logarithms
Although they can seem confusing at first sight, logarithms are just mathematical functions that allow calculations to be carried out quicker than would otherwise be the case. So although they may seen daunting, you should think of logarithms as a way to make calculations easier – once you have mastered the rules. There is quite a … Continue reading How to Use Logarithms
Spin Cooling
Having recently posted a general piece about spin in general (https://physbang.com/2024/11/24/what-is-spin/) I thought it would be useful to discuss one particular use of spin in a practical context; cooling. Suppose we have a material with a single unpaired electron in each of its atoms. The lone electrons can either be spin-up or spin-down and on … Continue reading Spin Cooling
Death and Data Analysis
It sounds like an unlikely scientific challenge but a recent BBC Radio 4 program about dismembered feet that have been washed-up on Canadian and US shores is a great puzzle to tax inquisitive brains. Despite what may appear to be an off-topic context (for the usual range of physbang items) the story's challenge to make … Continue reading Death and Data Analysis
Mr Tarrant's physbang 'blog 