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4 November, 05:59

If there are 50 grams of U-238 on day zero of radioactive decay, how much will there be after 4.5 billion years? A) 0.0 grams B) 10 grams C) 25 grams D) 50 grams

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  1. 4 November, 08:44
    0
    = 25 g

    Explanation:

    Using the formula;

    A = A₀ (1/2) ^ (t/h)

    where A is the final amount,

    A₀ is the initial amount of the substance,

    t is the time and

    h is the half-life of the substance,

    In this case; the half life of U-238 h is equal to 4.47 billion years.

    A = A₀ (1/2) ^ (t/h)

    A = 50 (1/2) ^ (4.5 / 4.47)

    = 24.88

    = 25 g
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