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What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years?
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What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remains after 3.0 years?

User Glynbeard
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Answer:

125 / 500 = 1/4 of the sample left after 3.0 yrs

1/2 * 1/2 = 1/4 sample has decayed thru 2 half-lives

2 * HL = 3

1 Half-Life = 1.5 yrs

User Psergiocf
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