A wooden object from a prehistoric site has a carbon-14 activity of 10 cpm compared to 40 cpm for new wood. If carbon-14 has a half-life of 5730 yr, what is the age of the wood?

The answer to your question is 11460 years

Explanation:

Data

Carbon-14 activity 10 cpm

half-life = 5730 yr

Real carbon-14 activity 40 cpm

Process

1. - Write a chart to solve this problem

Real carbon-14 40 cpm Time 0 years

After a half-life 20 cpm Time 5730 years

After a half-life 10 cpm Time 5730 years

Total time 11460 years

2. - Conclusion

The wooden object is 11460 years old.