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ale4655
[162]
2 years ago
14
If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is __
_________ years old
Chemistry
Answer
Comment
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1
answer:
poizon
[28]
2 years ago
4
0
25% remaining =
40,000
years old
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