Question

Tritium, a radioactive isotope of hydrogen, has a half-life of 12.4 years. Of an initial sample of 69 grams, how much will remain after 75 years?
the amount left in t years is

69*(1/2)^(t/12.4)

so, plug in t=75

Note that that's about 6 half-lives.
1.5848
Answer is actually 1.04257

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