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12 September, 09:04

The half-life of cobalt-60 is 5.26 years. After 10.52 years, 5 grams of a 20-gram sample will remain. true or false?

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  1. 12 September, 09:22
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    True

    Explanation:

    Given dа ta:

    Mass of cobalt = 20 g

    Half life = 5.26 years

    Mass remain after 10.52 years = 5 g

    Solution:

    Number of half lives = T elapsed / half life

    Number of half lives = 10.52 years / 5.26 years

    Number of half lives = 2

    At time zero = 20 g

    At first half life = 20 g / 2 = 10 g

    At second half life = 10 g/2 = 5 g

    The given statement is true.
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