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29 July, 08:03

After two half-lives, how much of the original material has decayed? 25 percent 50 percent 75 percent 100 percent

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Answers (2)
  1. 29 July, 09:11
    0
    After two half lives the sample will remain 25%.

    Explanation:

    Given dа ta:

    Number of half lives given = 2

    Mass remain after two half lives = ?

    Solution:

    Consider that original sample is 100 g.

    At time zero = 100 g

    After first half life = 100 / 2 = 50 g

    After second half life = 50 g / 2 = 25 g

    So after two half lives the sample will remain 25%.
  2. 29 July, 10:59
    0
    75% of the material has decayed.

    Explanation:

    Hello,

    We can start this problem by solving the first half-life assuming the arbitrary condition stating that the initial concentration has a value of 100M, thus, for the first half-life, the concentration dwindles to 50M. Afterwards, the second half-life yields a concentration of 25M, meaning that the 75% of the material has decayed up to the second half-life, of course, the half of the result from the first half-life.

    Best regards.
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