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from mrmackenzie
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 more dosimetry
from mrmackenzie
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
from mrmackenzie
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
from mrmackenzie
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!
from mrmackenzie
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
from mrmackenzie
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
from mrmackenzie
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
from mrmackenzie
Here are the answers to the waves & radiation questions.
from mrmackenzie
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!
from mrmackenzie
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.