Rubidium-87 has a half-life of `4.9*10^10` years and decays to strontium-87, which is stable. In an ancient rock, the ratio of Sr-87 to Rb-87 is 0.005. If we assume all the strontium came from rubidium decay, about how old is the rock? Repeat if the ratio is 0.210.
`3.54*10^8" years"` resp. `1.35*10^10" years"`
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