Question

A meteorite was found to contain 40 argon-40 atoms for every 10 potassium-40 atoms. The half-life of postassium-40 is 1.25 billion years. Assuming no loss of daughter isotopes, how old is the moon rock?
2.5 billion years old

3.75 billion years old

6.75 billion years old

10.5 billion years old

Answer 1

Supposed the moon rock should be 10.5 billing years old