Answer: In a piece of rock from the Moon, the 87Rb content
Chapter , Problem 51(choose chapter or problem)
In a piece of rock from the Moon, the 87Rb content is assayed to be 1.82 3 1010 atoms per gram of material and the 87Sr content is found to be 1.07 3 109 atoms per gram. (The relevant decay is 87Rb S 87Sr 1 e2. The half-life of the decay is 4.8 3 1010 yr.) (a) Determine the age of the rock. (b) Could the material in the rock actually be much older? (c) What assumption is implicit in using the radioactive-dating method?
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