neciababy neciababy
  • 16-05-2016
  • Chemistry
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If 25% of a radioactive element remains after 1,000 years, what is the half-life?

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Leader
Leader Leader
  • 16-05-2016
The half-life would be 500 years.

25% means that 2 half-lives have already passed. So one half-life is 500 years.
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