Radioactivity And Particles: Units
Bayani Gaba-gaba
Radioactive sources do not switch on and off like a lamp. They decay continuously, and measuring how quickly that happens requires its own set of units. A hospital physicist tracking a tracer dose and a geologist dating an ancient rock both rely on the same handful of quantities and units.
This lesson covers the units the Edexcel specification expects you to use in the Radioactivity and Particles section, from the becquerel for activity to the everyday time units that appear in half-life calculations. You will practise converting between seconds, minutes, and hours so that substitution into decay equations stays error-free.
Manufura
- Use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min) and second (s)
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- What does one becquerel (Bq) represent? A) One gram of radioactive material B) One decay per second C) One count per minute D) One half-life Answer: B
- How many seconds are in 2.5 hours? A) 150 B) 250 C) 1500 D) 9000 Answer: D
- A source has an activity of 1600 Bq. After two half-lives, the activity is: A) 800 Bq B) 400 Bq C) 200 Bq D) 100 Bq Answer: B
- What is the difference between activity and count rate? A) Activity is measured in count/s, count rate in Bq B) Activity is the true decay rate; count rate is what the detector records C) Count rate is always higher than activity D) There is no difference Answer: B
- A half-life is 40 minutes. How many half-lives occur in 3 hours? A) 3 B) 4 C) 4.5 D) 7.5 Answer: C
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