Pre-Calc

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?

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  3. 👁 1,062
  1. 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.

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  2. 1.5848

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    2. 👎 1
  3. Answer is actually 1.04257

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