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- A radioactive substance has a half-life of 30 minutes.
What fraction of the atoms will not have decayed after
1 hour?
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for answer
- Another substance has a half-life of 3 hours.
What fraction of the atoms will have decayed after 6 hours?
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for answer
- A researcher measures 200 counts per minute coming from a radioactive
source at midday.
At 3 o'clock, she finds that this has dropped to 25 counts per
minute.
What is the half-life of the radioactive source?
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for answer
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