Posted by **Nicole** on Thursday, October 25, 2012 at 6:40pm.

How do I do the foll9owing example?

K-40 - A-40 (1.25 billion years)

After careful analysis, a geochronologist determines that an unweathered, unmetamorphosed mineral sample contains 7 trillion atoms of the radioactive element K-40 and 105 trillion atoms of its decay product A-40. The number of years ago that the sample formed is:

## Answer This Question

## Related Questions

- Chem 2 - The half-life for the radioactive decay of U-238 is 4.5 billion years ...
- College Geology - assume that a particular radioactive-isotope has a half-life ...
- Math - What are the 3 numbers that com after trillion. I'm talk about this- Ex: ...
- Chemistry - Rubbing alcohol often contains propanol, C3H7OH. Suppose you have an...
- Physics - A sample contains 3.5×1019 radioactive atoms with a half life of 10000...
- math - the ratio of hydrogen atom to oxygen atoms in water is 2:1 if an amount ...
- science - radioactive decay occurs when atoms a) lose mass b) join with atoms of...
- Physcis 30 - Q1) If there are 100 radioactive atoms with a half-life of 30 ...
- science - during radioactive decay atoms of a radioactive element break down and...
- math - If the consumption function is C = $200 billion + 0.6Y, (a) How much do ...

More Related Questions