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Starting with 195 grams of a radioactive isotope, how much will be left after 3 half-lives?
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Starting with 195 grams of a radioactive isotope, how much will be left after 3 half-lives?

User Francis Martens
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After one half-life:
(1)/(2)* 195=97.5 grams.

After two half-lives:
(1)/(2) * 97.5=48.75 grams.

After three half-lives:
(1)/(2) * 48.75=24.375 grams.
User Bitifet
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