In a piece of rock from the Moon, the 87Rb content is assayed to be 1.84 1010 at

Question

In a piece of rock from the Moon, the 87Rb content is assayed to be 1.84 1010 atoms per gram of material and the 87Sr content is found to be 1.00 109 atoms per gram. (The relevant decay is 87Rb 87Sr + e-. The half-life of the decay is 4.8 1010 yr.) (a) Determine the age of the rock. ??????? yr (b) Could the material in the rock actually be much older? CHOOSE ONE OF THE FOLLOWING ANSWERS -No, it could not be any older. -Yes, it could be much older. What assumption is implicit in using the radioactive-dating method? CHOOSE ONE OF THE FOLLOWING ANSWERS -We assume that none of the 87Sr nuclei came from the decay of 87Rb nuclei -We assume that some of the 87Sr nuclei came from the decay of 87Rb nuclei while the rest was present initially -We assume that all of the 87Sr nuclei came from the decay of 87Rb nuclei

Explanation / Answer

Yes, it could be much older. -We assume that all of the 87Sr nuclei came from the decay of 87Rb nuclei

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