How many half-lives are required to yield a mineral with 2,000 atoms of parent isotope and 30,000 atoms of daughter isotope? If the half-life of the parent-daughter isotope pair is 1.0 billion years, how old is the rock? Please show your work
What will be an ideal response?
The Parent+Daughter=Total, so 2000+30000 = 32000
P D HL
32000 0 0
16000 16000 1
8000 24000 2
4000 28,000 3
2,000 30,000 4
4 x 1by = 4 billion years old
The answer is 4 half-lives have gone by; the age of the rock is 4 billion years old.
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