Chemistry, 18.01.2020 04:31 nkazmirski5598
The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 ã 109 yr. a sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms. the age of the rock is:
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The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 ã 109...
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