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21 October, 07:02

Thorium-234 has a half life of about 25 days. What percent of the thorium will remain after 125 days

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  1. 21 October, 07:58
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    3.125% will remain after 125 days

    Explanation:

    Given dа ta:

    Half life of Th-234 = 25 days

    Percent of thorium remain after 125 days = ?

    Solution:

    Number of half lives = T elapsed / half life

    Number of half lives = 125 days / 25 days

    Number of half lives = 5

    At time zero = 100%

    At 1st half life = 100%/2 = 50%

    At second half life = 50%/2 = 25%

    At third half life = 25% / 2 = 12.5%

    At 4th half life = 12.5% / 2 = 6.25%

    At 5th half life = 6.25% / 2 = 3.125%
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