3 years ago

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

1 answer:

4 0

After one half-life: $\frac{1}{2}\times 195=97.5$ grams.

After two half-lives: $\frac{1}{2} \times 97.5=48.75$ grams.

After three half-lives: $\frac{1}{2} \times 48.75=24.375$ grams.

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