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A rock originally had 4800 atoms of 40K and no 40Ar. It now has 800 atoms of 40K. Assuming that the only chemical process is radioactive decay of potassium to argon,
a) 1.576 billion years
b) 1.375 billion years
c) 3.357 billion years
d) 4.660 billion years
e) 5.303 billion years
what is the age of the rock?
Answers: 3
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A rock originally had 4800 atoms of 40K and no 40Ar. It now has 800 atoms of 40K....
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