A rock contain 3.2 grams of a radioactive isotope, Ask an Expert

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Q. A rock contain 3.2 grams of a radioactive isotope, uranium-235, . Determine what was the original amount of uranium-235 in the rock If the rock has undergone 2.75 half lives, and how old is the rock?

Q. An igneous rock found to be having 3 grams of uranium-238 in it.(a) What are the parent and daughter concentrations ( in percentages) , (b) what is its age? (c) When dated the rock only contains 1.8 grams. ?

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