1. What happens to the amount of ‘mother’ nuclei as time passes?
Decrease
2. What sort of radioisotope will decay the fastest - one with a long half life or one with a short half life?
One with a short half life
3. Does half life tell us exactly when a particular nucleus in a radioisotope will decay?
No. It is a random process - we can not know exactly when a particular nucleus will decay
4. What are the two definitions of half life?
a. The time taken for the activity of a sample to halve
b. The time taken for the number of radioactive atoms in a sample to halve
5. What does the activity of a source mean?
The number of decays per second
6. What is the unit of activity?
Becquerel (Bq)
7. What will happen to the number of ‘mother’ nuclei after two half lives?
1xhalf life 2xhalf life
The number of mother nuclei will be ¼ of the original number
8. What will happen to the activity of a source after two half lives?
1xhalf life 2xhalf life
The activity will be ¼ of the original activity
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