If you start with 100 grams of radioactive carbon, and 50 grams remain after 5730 years, what is the half-life of the isotope?

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David Douglas · Answer 1 · 2018-07-30T09:42:43+0000

The isotope has a half-life of 5730 years.

In 5730 years, the isotope (Carbon-14, to be more exact) will lose 50% of its mass, meaning that in 11460 years, 25 grams of Carbon-14 will remain.

If you start with 100 grams of radioactive carbon, and 50 grams remain after 5730 years, what is the half-life of the isotope?

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