If You Obtained a Sample of Rock from Venus and Determined

question 64

Multiple Choice

If you obtained a sample of rock from Venus and determined the abundances of uranium (²³⁸U) and lead (²⁰⁷Pb) in it, and found that for every one uranium atom there were three lead atoms, what would be the age of this rock? Note that this form of uranium decays to this form of lead with a half-life of 700 million years.For simplicity, you can assume that there were no lead atoms of this specific isotope in the rock when it originally formed.

• A) 1.4 billion years
• B) 2.8 billion years
• C) 4.0 million years
• D) 10.5 billion years
• E) 3.6 billion years

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