What would the percentage of thorium- 232 be
What would the percentage of thorium- 232(parent compound) be in a rock that was dated at 1.4 billion years?
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A rock is found to contain 3.2 grams of uranium-235, a radioactive isotope. If the rock has undergone 2.75 half lives, what was the original amount of uranium-235 in the rock and how old is the rock?
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