A nuclear physicist finds 1.0 g of 236 U in a piece of uranium ore and assumes
Question:
A nuclear physicist finds 1.0 μg of 236U in a piece of uranium ore and assumes it is primordial since its half-life is 2.3 x 107 y.
(a) Calculate the amount of 236U that would had to have been on Earth when it formed 4.5 x 109 y ago for 1.0 μg to be left today.
(b) What is unreasonable about this result?
(c) What assumption is responsible?
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