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Rubidium-strontium dating. The rubidium isotope 8737Rb, a β emitter with a half-life of 4.75×1010yr, is used...

Rubidium-strontium dating. The rubidium isotope 8737Rb, a β emitter with a half-life of 4.75×1010yr, is used to determine the age of rocks and fossils. Rocks containing fossils of ancient animals contain a ratio of 8738Sr to 8737Rb of 0.0320. Assuming that there was no 8738Sr present when the rocks were formed, estimate the age of these fossils.

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This question can be solved using decay rate equation and expression involving half life ( t1/2)

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