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Radioactive decay can be described by the following equation In A = In Ao - kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope radon-222, k is 1.81 x 10- days If the original amount of radon-222 in a sample is 72.3 mg, how much time is needed for the amount of radon-222 that remains to fall to 42.9 mg? days Submit Answer Retry Entire Group No more group attempts remain

Radioactive decay can be described by the following equation In A = In Ao - kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope radon-222, k is 1.81 x 10- days If the original amount of radon-222 in a sample is 72.3 mg, how much time is needed for the amount of radon-222 that remains to fall to 42.9 mg? days Submit Answer Retry Entire Group No more group attempts remain

College Algebra
College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter4: Exponential And Logarithmic Functions
Section: Chapter Questions
Problem 13CC
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Radioactive decay can be described by the following equation In A = In Ao - kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope radon-222, k is 1.81 x 10- days If the original amount of radon-222 in a sample is 72.3 mg, how much time is needed for the amount of radon-222 that remains to fall to 42.9 mg? days Submit Answer Retry Entire Group No more group attempts remain
Transcribed Image Text:Radioactive decay can be described by the following equation In A = In Ao - kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope radon-222, k is 1.81 x 10- days If the original amount of radon-222 in a sample is 72.3 mg, how much time is needed for the amount of radon-222 that remains to fall to 42.9 mg? days Submit Answer Retry Entire Group No more group attempts remain
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