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A rock sample from the moon includes a mineral that contains small amounts of the radioactive ...

A rock sample from the moon includes a mineral that contains small amounts of the radioactive isotope Potassium-40 and its daughter element Argon-40 (half-life of 1.3 billion years). This mineral would not form with any Argon-40. Consider a crystal with 7 atoms of Argon-40 for every 1 atom of Potassium-40. How many atoms of Potassium-40 were present when the crystal formed for each atom of Potassium-40 that exists today?
A) 1 B) 7 C) 8 D) None

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The Essential Cosmic Perspective

Edition: 7^th

Authors: Bennett, Donahue, Schneider, Voit

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