A Rock from the Moon Was Found to Contain 1

question 24

Multiple Choice

A rock from the moon was found to contain 1.0 * 10^-5 g of uranium-238 and 4.0 * 10^-6 g lead-206.All of the lead-206 came from the decay of uranium-238.The half-life for this decay is 4.5 * 10⁹ years.How old is this rock?

• A)1.0 * 10⁶ years
• B)3.3 * 10⁷ years
• C)4.1 *10⁸ years
• D)2.5 * 10⁹ years
• E)4.1 * 10¹⁰ years

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