Rubidium-87 has a half-life of 4.9 10 10 years and decays to strontium-87, which is stable.

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Rubidium-87 has a half-life of 4.9 × 1010 years and decays to strontium-87, which is stable. In an ancient rock, the ratio of 87Sr to 87Rb is 0.005 0. If we assume all the strontium came from rubidium decay, about how old is the rock? Repeat if the ratio is 0.210.

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