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A is a radioactive substance with a half-life of 2 hours. B is a radioactive substance with a half-life of 1 hours. Substance B initially has twice as many atoms of substance A. Which of the following statements about samples A and B is true? A. After 1 hour, a larger percentage of undecayed atoms will be left in sample B than in sample A. B. After 1 hour, a larger number of atoms will have decayed in sample A than in sample B. C. After 2 hours, both samples will have the same number of undecayed atoms. D. After 2 hours, the same number of atoms will have decayed in both samples.

A is a radioactive substance with a half-life of 2 hours. B is a radioactive substance with a half-life of 1 hours. Substance B initially has twice as many atoms of substance A. Which of the following statements about samples A and B is true? A. After 1 hour, a larger percentage of undecayed atoms will be left in sample B than in sample A. B. After 1 hour, a larger number of atoms will have decayed in sample A than in sample B. C. After 2 hours, both samples will have the same number of undecayed atoms. D. After 2 hours, the same number of atoms will have decayed in both samples.

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter18: Nuclear Reactions
Section: Chapter Questions
Problem 56QAP
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A is a radioactive substance with a half-life of 2 hours. B is a radioactive substance with a half-life of 1 hours. Substance B initially has twice as many atoms of substance A. Which of the following statements about samples A and B is true? A. After 1 hour, a larger percentage of undecayed atoms will be left in sample B than in sample A. B. After 1 hour, a larger number of atoms will have decayed in sample A than in sample B. OC. After 2 hours, both samples will have the same number of undecayed atoms. D. After 2 hours, the same number of atoms will have decayed in both samples.
Transcribed Image Text:A is a radioactive substance with a half-life of 2 hours. B is a radioactive substance with a half-life of 1 hours. Substance B initially has twice as many atoms of substance A. Which of the following statements about samples A and B is true? A. After 1 hour, a larger percentage of undecayed atoms will be left in sample B than in sample A. B. After 1 hour, a larger number of atoms will have decayed in sample A than in sample B. OC. After 2 hours, both samples will have the same number of undecayed atoms. D. After 2 hours, the same number of atoms will have decayed in both samples.
1311 is an isotope of iodine used for the treatment of hyperthyroidism, as it is readily absorbed into the cells of the thyroid 1311 with gland. With a half-life of 8 days, it decays into 131 xe*, an excited xenon atom. A hospital receives a shipment of an activity of 6x1010 Bq. After 16 days, there are several patients that need to be given doses of 1×109 Bq each. How many patients can be treated? OA. 15 Patients OB. 30 Patients OC. 50 Patients OD. 60 Patients
Transcribed Image Text:1311 is an isotope of iodine used for the treatment of hyperthyroidism, as it is readily absorbed into the cells of the thyroid 1311 with gland. With a half-life of 8 days, it decays into 131 xe*, an excited xenon atom. A hospital receives a shipment of an activity of 6x1010 Bq. After 16 days, there are several patients that need to be given doses of 1×109 Bq each. How many patients can be treated? OA. 15 Patients OB. 30 Patients OC. 50 Patients OD. 60 Patients
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