Jump to: English Language Arts, compare and 8th grade dating lesson Contrast, grammar. Since most students will not know exactly what time of day they were born, for this activity you can count the current day and their birthdays as a full day. Teenager - Parent: What possibly Jose could have been doing out until . This project explores exponential graphs and how these are applied in radioactive decay, including carbon dating.

The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.

Question: What happens to the Carbon-14 when plants and animals die? This is the time it takes for half of the carbon-14 to decay.

Answer: When organisms containing C-14 die, there is no further intake of Carbon 14, so the Carbon- 14 concentration slowly decreases as individual unstable Carbon- 14 decay back into stable Nitrogen -14 atoms. For example, if the organism had 100 grams of carbon-14 when it died, after 5730 years the fossil would have 50 grams of carbon-14.

The original percentage of carbon-14 in an organism is the same as the percentage of carbon-14 in the environment today.

One assumes that the percent of C-14 in the environment has not changed (there is a chart that can be used to include fluctuations but for most science classes it is not considered).