= 1.4191x1017 s
k = 4.8843x10-18 s-1
The half-life of 238U is 4.5 x 109 yr. A sample of rock of mass 1.7 g is found to produce 30 dis/s. Assuming all the radioactivity is due to 238U, find the percent by mass of 238U in the rock.
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