How many half-lives have passed in each of the following situations? (a) Initially the sample is 120 cpm. After 25 minutes, the sample is 7.5 cpm. (b) The half-life of 78 g of a radioactive isotope is 4.5 sec. The sample has decayed for 36 sec. (c) How many cph did a Na-24 sample have initially if after 60.0 hours the sample has 1.25 cph and the half-life of Na-24 is 15.0 hours?
How many half-lives have passed in each of the following situations? (a) Initially the sample is 120 cpm. After 25 minutes, the sample is 7.5 cpm. (b) The half-life of 78 g of a radioactive isotope is 4.5 sec. The sample has decayed for 36 sec. (c) How many cph did a Na-24 sample have initially if after 60.0 hours the sample has 1.25 cph and the half-life of Na-24 is 15.0 hours?
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter20: Nuclear Chemistry
Section: Chapter Questions
Problem 20.20QP
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How many half-lives have passed in each of the following situations?
(a) Initially the sample is 120 cpm. After 25 minutes, the sample is 7.5 cpm.
(b) The half-life of 78 g of a radioactive isotope is 4.5 sec. The sample has decayed for 36 sec.
(c) How many cph did a Na-24 sample have initially if after 60.0 hours the sample has 1.25 cph and the half-life of Na-24 is 15.0 hours?
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