71. The initial mass of the radioactive isotope of sodi

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71. The initial mass of the radioactive isotope of sodium 2111Na (half-life T1 / 2 = 62) is 0.3 mg. Determine the initial activity of the isotope and its activity after 5 minutes.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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