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U-238 Has a Half-Life of 4

Question 19

Multiple Choice

U-238 has a half-life of 4.5 billion years and a present day abundance of 99.3%.U-235 has a half-life of 0.7 billion years and a present day abundance of 0.7%.Assuming a steady rate of decay,how long ago did these two isotopes have the same abundance?


A) 4.1 billion years ago
B) 5.2 billion years ago
C) 5.9 billion years ago
D) 8.4 billion years ago
E) 9.9 billion years ago

Correct Answer:

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