A certain element has a half life of 4.5 billion years. a. You find a rock containing a mixture of the element and lead. You determine that 60 % of the original element remains; the other 40 % decayed into lead. How old is the rock? b. Analysis of another rock shows that it contains 5 % of its original element; the other 95 % decayed into lead. How old is the rock?
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