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21 June, 15:48

How many half lives have passed if a sample contains one sixteenth of its original amount of radioactive material

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Answers (2)
  1. 21 June, 16:45
    0
    4.

    Half life 1: 1/2

    Half life 2: 1/4

    Half life 3: 1/8

    Half life 4: 1/16
  2. 21 June, 19:20
    0
    Four half lives have passed because the amount is cut in half each time
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