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1.) A researcher claims that an ancient scroll originated from Greek scholars in about 500 B.C. Its carbon-14 decay rate is 95 % of that found in living organisms.  How old is the scroll? (The half-life of  carbon-14 is 5730 yr)   2.) Plutonium-236 is an alpha emitter with a half-life of 2.86 years. How long will it take for the 1.20 mg sample of Pu−236  to decay to 0.160 mg ?

1.) A researcher claims that an ancient scroll originated from Greek scholars in about 500 B.C. Its carbon-14 decay rate is 95 % of that found in living organisms.  How old is the scroll? (The half-life of  carbon-14 is 5730 yr)   2.) Plutonium-236 is an alpha emitter with a half-life of 2.86 years. How long will it take for the 1.20 mg sample of Pu−236  to decay to 0.160 mg ?

Chemistry: An Atoms First Approach
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter18: The Nucleus: A Chemist's View
Section: Chapter Questions
Problem 30E
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1.) A researcher claims that an ancient scroll originated from Greek scholars in about 500 B.C. Its carbon-14 decay rate is 95 % of that found in living organisms. 

How old is the scroll? (The half-life of  carbon-14 is 5730 yr)
 
2.) Plutonium-236 is an alpha emitter with a half-life of 2.86 years. How long will it take for the 1.20 mg sample of Pu−236  to decay to 0.160 mg ?
 
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