Unit test
Half-life
- The half-life of iron-61 is 6 minutes. If a sample originally contains 8 g of the isotope, how much remains after 18 minutes? your reasoning.
- The ratio of carbon-14 to nitrogen-14 in an artifact is 1:3. In other words, ¼ of the original carbon-14 remains. Given that the half-life of carbon-14 is 5730 years, how old is the artifact?
Write 2 – 3 sentences explaining your reasoning for each of above.