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March 28, 2015

Homework Help: physics

Posted by Anonymous on Wednesday, October 10, 2012 at 8:40pm.

The rubidium isotope 87Rb is a β emitter that has a half-life of 4.9 x 1010 y that decays into 87Sr. It is used to determine the age of rocks and fossils. Rocks containing the fossils of early animal have a ratio of 87Sr to 87Rb of 0.004. Assuming that there was no 87Sr present when the rocks were formed, calculate the age of the fossils.

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