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12 April, 22:25

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?

A.

75 g

B.

50 g

C.

100 g

D.

25 g

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Answers (1)
  1. 12 April, 22:47
    0
    25g

    Explanation:

    Given parameters:

    Half life of X = 5days

    Mass of sample of radioactive elements = 100g

    The half-life of a radioactive material is the time it takes for a sample to decay by half. At the half-life, an original sample would have yielded equal daughter to parent ratio.

    At time (days) Mass of sample

    0 100g

    5 50g

    10 25g

    Every 5 days, the sample will split into half.

    Therefore, 25g will remain after 10days.
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