63 O A rock recovered from far underground is found to con- tain 0.86 mg of 23$U, 0.15 mg of 206Pb, and 1.6 mg of Ar. How much "K will it likely contain? Assume that "K decays to only 40Ar with a half-life of 1.25 x 10° y. Also assume that 238U has a half-life of 4.47 x 10° y.

63 O A rock recovered from far underground is found to con- tain 0.86 mg of 23$U, 0.15 mg of 206Pb, and 1.6 mg of Ar. How much "K will it likely contain? Assume that "K decays to only 40Ar with a half-life of 1.25 x 10° y. Also assume that 238U has a half-life of 4.47 x 10° y.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter31: Radioactivity And Nuclear Physics

Section: Chapter Questions

Problem 18CQ: In a 3109 yearold rock that originally contained some 238U, which has a halflife of 4.5109 years, we...

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Data from the appendices and the periodic table may be needed for these problems. A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85107Bq. (a) What is the present activity in mCi? (b) How long ago did it actually have a 4.00—mCi activity?
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In the following eight problems, write the complete decay equation for the given nuclide in the complete XZAN notation. Refer to the periodic table for values of Z. decay of 40K, a naturally occurring rare isotope of potassium responsible for some of our exposure to background radiation.
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