Find the number of carbon atoms in the sample. (b) Find the number of carbon-14 atoms in the sample. (c) Find the decay constant for carbon-14 in inverse seconds. s−1 (d) Find the initial number of decays per week just after the specimen died. decays/week (e) Find the corrected number of decays per week from the current sample. decays/week (f) From the answers to parts (d) and (e),
Find the number of carbon atoms in the sample. (b) Find the number of carbon-14 atoms in the sample. (c) Find the decay constant for carbon-14 in inverse seconds. s−1 (d) Find the initial number of decays per week just after the specimen died. decays/week (e) Find the corrected number of decays per week from the current sample. decays/week (f) From the answers to parts (d) and (e),
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 28E
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A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5 730 yr) for every 7.70 1011 stable carbon atoms. An archeological sample of wood (cellulose, C12H22O11) contains 22.1 mg of carbon. When the sample is placed inside a shielded beta counter with 88.0% counting efficiency, 761 counts are accumulated in one week. We wish to find the age of the sample.
(a) Find the number of carbon atoms in the sample.
(b) Find the number of carbon-14 atoms in the sample.
(c) Find the decay constant for carbon-14 in inverse seconds. s−1
(d) Find the initial number of decays per week just after the specimen died. decays/week
(e) Find the corrected number of decays per week from the current sample. decays/week
(f) From the answers to parts (d) and (e), find the time interval in years since the specimen died. yr
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