A Rock Contains 0

question 4

Multiple Choice

A rock contains 0.167 mg of lead-206 for each milligram of uranium-238.The half-life for the decay of uranium-238 to lead-206 is 4.5 × 10⁹ yr.The rock was formed ________ years ago.

• A)7.52 × 10⁸
• B)6.08 × 10⁸
• C)7.95 × 10⁸
• D)1.15 × 10⁹
• E)8.77 × 10⁸

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