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OpenStudy (anonymous):
Suppose the half-life of an isotope is 10 years. After how many years will half of this isotope have decayed into its daughter element? 5 years 10 years 20 years
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OpenStudy (aaronq):
a "half-life" is the amount it takes for a substance to decay to one half of the original amount. If i have 100 gram of a substance that has a half-life of 5 min, 5 min later i'll have 50 grams.
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