Multiple Choice
An ancient rock is found to contain 40Ar gas,indicating that 77% of the 40K in the rock has decayed since the rock solidified.Any argon would have boiled out of liquid rock.How long ago did the rock solidify? The half-life of 40K is 1.25 billion years.
A) 2.6 billion years
B) 0.5 billion years
C) 1.8 billion years
D) 0.3 billion years
Correct Answer:
Verified
Correct Answer:
Verified
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