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Physics or Chemistry (depending on the context of the text)
Questions (1)
A radioisotope has a half-life of 7.5 hours. How many half lives have occured after 67.5 hours?
a 7 half-lives b 8 half-lives c 9
3 answers
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Subcategories (1)
Radioactivity or Nuclear Decay
Parent Categories (1)
Science
