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OpenStudy (virtualachieve):
A radioactive substance has a half-life of 5 million years. What is the age of a rock in which 25% of the original radioactive atoms remain?
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OpenStudy (welshfella):
By the definition of half-life , one half of the original radioactive substance remain after 5 million years. So 25% ( that is one quarter) will remain after how many more years?
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