Question: The rubidium isotope 87 Rb is a emitter with a half-life of 4.9 10 10 y that decays into 87 Sr. It is

The rubidium isotope ⁸⁷Rb is a β emitter with a half-life of 4.9 × 10¹⁰ y that decays into ⁸⁷Sr. It is used to determine the age of rocks and fossils. Rocks containing the fossils of early animals contain a ratio of ⁸⁷Sr to ⁸⁷Rb of 0.0100. Assuming that there was no ⁸⁷Sr present when the rocks were formed, calculate the age of these fossils.

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