Physics: Radioactivity And Particles: Units
Bayani Gaba-gaba
Radioactivity is invisible, silent and completely beyond the reach of your senses. The only way to say anything useful about a radioactive source is to attach numbers to it, and numbers in physics are worthless without the right units.
This short lesson covers the handful of units you need for the whole radioactivity topic: the becquerel for activity, the centimetre for the distances and thicknesses used in absorption experiments, and the second, minute and hour for the times that appear in half-life questions. You will also practise the conversions that examiners build into calculation questions.
Manufura
- Use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min) and second (s)
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Barka da kammala darasi akan Physics: Radioactivity And Particles: Units. Yanzu da kuka bincika mahimman ra'ayoyi da ra'ayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
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- The becquerel is the unit of: A) Half-life B) Activity C) Absorbed dose D) Count rate in a detector Answer: B
- An activity of 1 Bq means: A) One decay per minute B) One decay per hour C) One decay per second D) One thousand decays per second Answer: C
- A source has an activity of 2.5 kBq. In becquerels this is: A) 25 Bq B) 250 Bq C) 2500 Bq D) 25000 Bq Answer: C
- A detector records 600 counts in 5 minutes. The count rate in counts per second is: A) 2 counts per second B) 120 counts per second C) 12 counts per second D) 0.5 counts per second Answer: A
- An absorber is 6 mm thick. In centimetres this is: A) 0.06 cm B) 0.6 cm C) 6 cm D) 60 cm Answer: B
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Sashen littafi
Biological Effects of Radiation
Describe the biological impact of ionizing radiation
"Chemistry: Biological Effects of Radiation" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/21-6-biological-effects-of-radiation. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
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