When an organism dies, it ceases to absorb Carbon 14 from the atmosphere and the Carbon 14 within the organism decays exponentially, becoming Nitrogen 14, with a half-life of approximately 5730 years. Carbon 12, however, is stable and so does not decay over time.

## How many years does carbon-14 undergo 3 half lives?

5730 years The half-life of carbon-14 is 5730 years. 1 half-life there is 50%=12 of the original amount left. 2 half-lives there is 25%=14 of the original amount left. 3 half-lives there is 12.5%=18 of the original amount left.

## What is the percent annual decay rate of carbon-14?

When finding the age of an organic organism we need to consider the half-life of carbon 14 as well as the rate of decay, which is –0.693. For example, say a fossil is found that has 35% carbon 14 compared to the living sample. How old is the fossil?

Isotopes of nitrogenIsotopeabundancehalf-life (t1/2)13Nsyn9.965 min14N99.6%stable15N0.4%stable

## What percent of carbon-14 will remain after 11400 years?

The currently accepted value for the half-life of 14C is 5,730 years. This means that after 5,730 years, only half of the initial 14C will remain; a quarter will remain after 11,460 years; an eighth after 17,190 years; and so on.