The argon-40 method of radioisotope dating,which was developed to determine the age of moon rocks,assumes that no 40Ar gas was trapped when the molten rock solidified and that no 40Ar could escape from the solid rock.Potassium-40 decays into argon-40 by positron emission with a half-life of 1.28 
109 years.One sample of moon rock showed a ratio of 40K to 40Ar of 0.100 (NK/NAr = 0.100).How many years ago was this moon rock formed?
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_TB6561_11 109 yrs If NK/NAr =...View Answer
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