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Meihui is at NASA analyzing Moon rocks. In one of the rocks from the lunar highlands,...

Meihui is at NASA analyzing Moon rocks. In one of the rocks from the lunar highlands, he discovered 37 % of the original uranium-238 remains, while remaining amount of uranium-238 had decayed into lead. The half life of uranium-238 is 4.5 × 109 years. Assume the only decay product is lead. How old is the lunar maria rock in billions of years (109 years)?

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Solution- 4.5 X10 Half-life till= 4:5X103 0.693 – 4.5 x10? Therefore, t= C 0.693 4:58209 U-238 left (P) = 374. Lead, Pb, boym

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