Concept explainers
Radioactive decay and mass spectrometry are often used to date rocks after they have cooled from a magma.
A rock was dated by assaying the product of this decay. The mass spectrum of a homogenized sample of rock showed the
Calculate the following:
the
a. the original concentration of Rb in the rock in ppm
b. the percentage of rubidium-87 decayed in the rock
c. the time since the rock cooled
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