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A certain element has a half life of 4.5 billion years. a. You find a rock...

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 20 ?% of the original element? remains; the other 80 ?% decayed into lead. How old is the? rock? b. Analysis of another rock shows that it contains 60 ?% of its original? element; the other 40 ?% decayed into lead. How old is the? rock?

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