The starter and exit quiz of the lesson “Activity and half-life calculations”, from the unit “Nuclear physics” (Year 11 Science) by Oak National Academy.
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Oak National Academy
12 questions
Which of the following describes what is meant by a radioactive isotope having a half–life of 15 minutes?
How do the half–lives of different radioactive isotopes compare?
What effect does increasing the temperature have on the half–life of a radioactive isotope?
Starting with the longest, sort the following radioactive isotopes into order of decreasing half–life.
How does the half–life of a carbon–14 atom in a carbon monoxide (CO) molecule compare to its half–life in a carbon dioxide (CO₂) molecule?
A radioactive isotope has a half–life of 10 hours. Match each of the following fractions of the sample remaining to the correct amount of time that has passed.
The activity of a sample of a radioactive isotope is …
An activity of 100 becquerel (Bq) means …
Which of the following can be used to define what is meant by the half-life of a radioactive isotope?
A radioactive isotope has an initial activity of 800 Bq and a half–life of 5 minutes. Match each of the following activities of the sample to the correct amount of time that has passed.
Sodium-24 has a half-life of 15 hours. If a sample of sodium-24 originally has an activity of 500 Bq, what fraction of its original activity will remain after 30 hours?
After 42 days the activity of a sample of phosphorus–32 has decreased from 400 Bq to 50 Bq. What is the half–life of phosphorus–32?
