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09-09-2016
Chemistry

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radioisotope actinium 225 has half life of 10 days, I begin with 16 kg of this isotope, how much will remain after 40 days?

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09-09-2016

[tex]N(t)=N_{0}(\frac{1}{2})^\frac{t}{\tau_{_\frac{1}{2}}}}\\\\ N_{0}=16kg\\ t=40days\\ \tau_{_\frac{1}{2}}}=10days\\\\\\ N(t)=16kg*(\frac{1}{2})^{\frac{40}{10}}=16kg*\frac{1}{16}=1kg[/tex]

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