Ask Me Help Desk - How long will it take 1200g out of 1600 of this isotopes to decay

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How long will it take 1200g out of 1600 of this isotopes to decay

It will take two half-lives. If the half-life of your isotope is 1 hour, it will take 2 hours. If the half-life is 2000 years, it will take 4000 years.

$\frac{1600-1200}{1600}=\frac 14$

$log_{1/2}\; (\frac 14) = 2$

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