Physics: Radioactivity And Particles: Units
Bayani Gaba-gaba
Radioactivity calculations use time and activity, so you need to be comfortable converting between seconds, minutes and hours, and you need to understand the becquerel as the unit of radioactive decay rate.
This reference covers the five units for the radioactivity section of the Edexcel specification: becquerel, centimetre, hour, minute and second.
Manufura
- Use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min) and second (s)
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- One becquerel is equal to: A) 1 decay per minute B) 1 decay per second C) 1 decay per hour D) 100 decays per second Answer: B
- A source has a half-life of 30 minutes. After 90 minutes the activity will have decreased to: A) 1/2 of the original B) 1/4 of the original C) 1/8 of the original D) 1/16 of the original Answer: C
- The unit used to measure the thickness of an absorber in a radiation experiment is: A) metre B) centimetre C) millimetre D) kilometre Answer: B
- How many seconds are in 1.5 hours? A) 90 B) 900 C) 5400 D) 9000 Answer: C
- Activity is measured in: A) Coulombs B) Hertz C) Becquerels D) Watts Answer: C
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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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