Carbon-14 has a half-life of 5,730 years. A fossil is found that has 12% of the carbon-14 found in a living sample. How old is the fossil? (Round your answer to the nearest year.)

Answer 1

0.12 = (0.5 )^t/5730

ln 0.12 = (t/5730) ln 0.5

-2.12 ≈ (t/5730) (-0.69)

3.07 ≈ t/5730

17,605 ≈ t