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Activity of a given mass of radioactive gold from its half-life

The same question, asked 2 times: 2021 Paper 6*, 2021 Paper 14. Every wording below, oldest first.

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  1. Question 1

    2021 Paper 6

    9
    The half-life of Au198Au^{198} is 2.7 days. The activity of 1.50mg1.50mg of Au198Au^{198} if its atomic weight is 198 g mol−1198\text{ }g{\text{ }mol}^{- 1} is, (NA=6×1023/mol)\left( N_{A}= 6 \times10^{23}/mol \right)

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  2. Question 2

    2021 Paper 14

    7
    Half life time of Gold is 3 days. Find the activity of a sample of 2mg2mg of gold.

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