Analysis of a Moon rock shows that 82% of its initial K-40 has decayed to Ar-40, a

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Analysis of a Moon rock shows that 82% of its initial K-40 has decayed to Ar-40, a process with a half-life of 1.2x109 years. How old is the rock?

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Essential University Physics

ISBN: 978-0321976420

3rd Edition Volume 2

Authors: Richard Wolfsonby

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