The half-life of 238U, which decomposes to 206Pb, is 4.51 × 109 y. A rock contains equal masses of these two isotopes. How old is this rock?
A) 4.07 × 109 y
B) 4.06 × 109 y
C) 9.02 × 109 y
D) 4.51 × 109 y
E) 5.00 × 109 y
Correct Answer:
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