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Activity falls from one value to another with a half-life of 5 days: time taken

The same question, asked 2 times: 29 Jun 2022*, 27 Jul 2022. Every wording below, oldest first.

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  1. Question 1

    29 Jun 2022

    3
    The activity of a radioactive material is 2.56×10−32.56 \times10^{- 3} Ci. If the half life of the material is 5 days, after how many days the activity will become 2×10−5Ci2\times10^{- 5}Ci ?

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  2. Question 2

    27 Jul 2022

    108
    The activity of a radioactive material is 6.4×10−46.4 \times10^{- 4} curie. Its half life is 5 days. The activity will become 5×10−65 \times10^{- 6} curie after:

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