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What percentage (in percent) of the initial number of 2019

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Description

What percentage (in percent) of the initial number of nuclei of a radioactive element decays in a time equal to two half-lives?

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Additional information

Task 60508. Detailed solution with a brief record of the conditions, formulas and laws used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision, write. I will try to help.

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