The half-life of 238 U is 4.47 × 107 yr.
(a) Use equation (2.38) to compute the decay constant λ for 238 U.
(b) Suppose that 1000 mg of 238 U are present initially. Use the equation N = N0e–xλt and the decay constant determined in part (a) to determine the time for this sample to decay to 100 mg.
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