Carbon 12, however, is stable and so does not decay over time. Scientists estimate that the ratio of Carbon 14 to Carbon 12 today is approximately 1 to 1,000,000,000,000.

## What is the ratio of carbon-14 to carbon-12 atoms in the atmosphere?

approximately 1 : 1.35x10-12 And given the fact that the ratio of carbon 14 to carbon 12 in living organisms is approximately 1 : 1.35x10-12, we can figure out how many carbon 14 atoms were in the sample when it ceased to replenish its supply.

## Is the ratio of C 14 to C 12 in the atmosphere unpredictable?

The ratio of carbon-14 to carbon-12 in the atmosphere and on earth is nearly constant, although there has been some change in carbon-14 concentration over the last 10,000 years.

## What is the approximate ratio of C 12 to C 14?

The ratio of carbon-12 to carbon-14 is the same in all living things. However, at the moment of death, the amount of carbon-14 begins to decrease because it is unstable, while the amount of carbon-12 remains constant in the sample. Half of the carbon-14 degrades every 5,730 years as indicated by its half-life.

## What is C 14 most commonly used for?

In carbon-14 dating, measurements of the amount of carbon-14 present in an archaeological specimen, such as a tree, are used to estimate the specimens age. Carbon-14 present in molecules of atmospheric carbon dioxide enters the biological carbon cycle.