Question

3. Uranium-238 decays into lead. For a given amount of 238U, half is converted to lead every 4.5 million years.

a) If a sample is found with 1/8 (0.125) of the expected 238U, how old would this sample be? (2 points)
13.5 billion


b) For carbon-14, 60,000 years is the maximum age that can be accurately dated. What would be the maximum age of a sample if 238U were used? (3 points)

Answer 1

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