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12 March, 11:36

You have a sample of a radioactive isotope of an element called "mysterium." The

half life of "mysterium" is 16 days. If you start with a 300 g sample of "mysterium,"

what mass of "mysterium"will remain after 64 days?

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Answers (2)
  1. 12 March, 11:55
    0
    300 / 18.75 = 16

    answer: 18.75
  2. 12 March, 12:03
    0
    19.14g

    Explanation:

    t½ = 16 days

    N₀ = 300g

    N=?

    t = 64 days

    t½ = 0.693 / λ

    λ = 0.693 / t½

    λ = 0.693 / 16

    λ = 0.043

    N = N₀ e⁻λt

    N = 300e⁻⁰.⁰⁴³*⁶⁴

    N = 300 * 0.0638

    N = 19.14g

    The amount of mysterium sample left after 64 days is 19.14g
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