Multiple Choice
The lifetime of uranium 238 is 6.0 × 109 y, and that of uranium 235 is 1.0 × 109 y. The present abundance of uranium 238 is 140 times the abundance of uranium 235. What was the ratio of abundances 1 billion years ago?
A) 140:1
B) 6:1
C) 61:1
D) 161:1
E) 322:1
Correct Answer:
Verified
Correct Answer:
Verified
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