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19.07.2019 •
Chemistry
Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.
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Ответ:
Half-life is the time needed for a radioactive molecule to decay half of its mass. In this case, the strontium-89 is already gone past 5 half lives. Then, the percentage of the mass left after 5 half-lives should be:
100%*(1/2^5)= 100%/32=3..125%
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