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1. Define half-life.
2. Different radioactive materials have the same half-life, true
or false?
Higher tier only:
3. What is the half-life of an isotope that had an activity of
1000 at the start of
an experiment and 500 twenty minutes
later.
4. Technetium-99m is widely used in medicine. Its half-life is 6 hours.
If the mass of technetium-99m present in a sample is initially 120 g. What is roughly the
mass left of technetium-99m after 12 hours?
5. Complete the following table for the decay of lead-210 isotope
starting with
432 counts per minute initially.
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