Rubidium-strontium dating. The rubidium isotope 8737Rb, a βemitter with a half-life of 4.75×1010yr, is used to determine theage of rocks and fossils. Rocks containing fossils of ancientanimals contain a ratio of 8738Sr to 8737Rb of 0.0310.
Assuming that there was no 8738Sr3887Sr present when the rockswere formed, estimate the age of these fossils.
