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20 October, 08:00

What is the half life of each of these radioactive isotopes?

a radioactive isotope decreased to one-fourth its original amount in 18 months.

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Answers (2)
  1. 20 October, 08:21
    0
    One fourth means (one half) of (one half).

    So the 18 months must be two half-lifes.

    The half-life of this particular isotope is 9 months.
  2. 20 October, 10:53
    0
    The half life would be 9 months long.
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