Question

Carbon-14 is a radioactive isotope with a half-life of 5,730 years. How much carbon-14 would remain in a sample that is 11,460 years old?

Answer 1

`1/4`

Explanation:

`11460 = 2xx5730`
`11460` years is `2` half-lives.

By the first half-life, the amount of `"C"14` would be half the original amount.
By the second half-life, the amount of `"C"14` would have halved again, resulting in a quarter of the original amount of `"C"14`.