This week, we’ve looked at calculating radiation doses. The absorbed dose D, measured in Grays (Gy), takes into account the energy E absorbed and the mass m of the absorbing tissue. The higher the energy, the greater the absorbed dose. If you are wondering why the absorbing mass is important, consider the different masses of ... Read moredosimetry: absorbed dose and equivalent dose
We started looking at half-life today. The attached file walks you through different types of half-life problem. There are some questions for you to try along they way. The answers are at the end, please don’t cheat!
We’ve examined the operation of a Geiger-Müller counter as part of the radiation topic. image by Theresa Knott The Geiger-Müller (GM) counter is used to detect ionising radiation such as alpha and beta particles or gamma rays. The radiation enters through a very thin window at one end of the tube. This window is usually made ... Read moregeiger-müller tube
X-rays are a form of electromagnetic radiation. They have a much higher frequency than visible light or ultraviolet. The diagram below, taken from Wikipedia, shows where x-rays sit in the electromagnetic spectrum. image by Materialscientist Wilhelm Röntgen discovered x-rays and the image below is the first x-ray image ever taken. It shows Mrs. Röntgen’s hand and wedding ring. ... Read morex-rays
Earlier this week, we used semi-circular perspex blocks to investigate total internal reflection. I’ve put together a short video showing total internal reflection in a semicircular block and a perspex model of an optical fibre. total internal reflection from mr mackenzie on Vimeo. There are some nice ray diagrams explaining total internal reflection on BBC ... Read moretotal internal reflection
Here are the answers to the waves & radiation questions.
I’ve put together a collection of exam questions from old standard grade and intermediate 2 papers that fit the national 5 curriculum. Try these before moving on to past papers and check your answers using the solutions that I will post next. No cheating!
I’ve attached a short guide to half-life calculations. There are some questions after each worked example, answers are at the end of the sheet.
We’ve examined the operation of a Geiger-Müller counter as part of the radiation topic. image by Theresa Knott The Geiger-Müller (GM) counter is used to detect ionising radiation such as alpha and beta particles or gamma rays. The radiation enters through a very thin window at one end of the tube. This window is usually made ... Read morethe geiger-muller tube
Here are the solutions to the Electricity & Energy questions. Mark allocations are highlighted in red.