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12 October, 07:42

The half-life of a radioactive kind of element is 18 minutes. How much will be left after 36 minutes, if you start with 32 grams of it?

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Answers (2)
  1. 12 October, 08:37
    0
    There will be 8 grams left after 36 minutes.

    Step-by-step explanation:

    A half-life is how long it takes for half of the amount to go away. In this case, we see that we have two half-life periods worth, which you can determine by dividing the total time by the half-life time.

    36mins/16mins = 2 half lives.

    Now we can raise 1/2 to the power of how many half lives we have (2). Then we multiply that by the amount in the sample.

    (1/2) ^2 * 36

    1/4 * 36

    8 grams
  2. 12 October, 10:32
    0
    It's gonna be 8 grams
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