Posted by **M.T.** on Thursday, February 9, 2012 at 11:00pm.

The half-life of carbon 14, which is commonly used to date organic materials, is 5700 years. What is the minimum age of sample in which less than 1% of the organic carbon 14 is left?

- Intro to Astronomy -
**drwls**, Friday, February 10, 2012 at 8:57am
If 1% is left,

(0.01) = (0.5)^N

where N is the number of half-lives.

N = 6.644

minimum age = 37,900 years

There will be less than 1% left if the sample is older than that, so that is a minimum age.

There is not much about astronomy here

- Intro to Astronomy -
**Anonymous**, Thursday, March 31, 2016 at 4:48pm
Find the age for a rock for which you determine that 68% of the original uranium-238 remains, while the other 32% has decayed into lead.

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