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1. Half-life is the time taken for half of the radioactive material to decay.
2. Different radioactive materials have the same half-life: false.
Higher tier only:
3. The half-life of an isotope that had an activity of 1000 at the
start of an experiment
and 500 twenty 20 minutes
later is: 20 minutes.
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.
The mass left after 12 hours is 60 g.
5. Table for the decay of lead-210 isotope.
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