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(3) (HAND IN) After 1010 years a radioactive substance has decayed so that seven ninths of the original amount remains. (a) What is the half-life of this substance? (b) Given that after 1012 years the amount of substance remaining is 10 units determine the original amount. (c) How long will it take until only 3/80 of the initial amount remains?

(3) (HAND IN) After 1010 years a radioactive substance has decayed so that seven ninths of the original amount remains. (a) What is the half-life of this substance? (b) Given that after 1012 years the amount of substance remaining is 10 units determine the original amount. (c) How long will it take until only 3/80 of the initial amount remains?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter18: Nuclear Chemistry
Section: Chapter Questions
Problem 71QRT
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(3) (HAND IN) After 1010 years a radioactive substance has decayed so that seven ninths of the original amount remains. (a) What is the half-life of this substance? (b) Given that after 1012 years the amount of substance remaining is 10 units determine the original amount. (c) How long will it take until only 3/80 of the initial amount remains?
Transcribed Image Text:(3) (HAND IN) After 1010 years a radioactive substance has decayed so that seven ninths of the original amount remains. (a) What is the half-life of this substance? (b) Given that after 1012 years the amount of substance remaining is 10 units determine the original amount. (c) How long will it take until only 3/80 of the initial amount remains?
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