The half-life of uranium-238 is about 4.5 10 9 years, and its end product is lead-206.
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The half-life of uranium-238 is about 4.5 × 109 years, and its end product is lead-206. We notice that the oldest uraniumbearing rocks on Earth contain about a 50:50 mixture of 238U and 206Pb. Roughly, what is the age of these rocks?
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