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Concept explainers
(a)
Interpretation:
To analyse whether the given statement - Half-life is the time it takes one-half of a radioactive sample to decay, is true or not.
Concept Introduction:
Half-life is defined as a time required for decaying one-half part of any sample which is a radioactive material. Some elements are having isotopes that decay and disappear in a day while some can remain radioactive for billions of years. It can be calculated as below:
(b)
Interpretation:
To analyse whether the given statement − The concept of half-life refers to nuclei undergoing alpha, beta, and positron emission; it does not apply to nuclei undergoing gamma emission, is true or not.
Concept Introduction:
Half-life is defined as a time required for decaying one-half part of any sample which is a radioactive material. Some elements are having isotopes that decay and disappear in a day while some can remain radioactive for billions of years. It can be calculated as below:
(c)
Interpretation:
To analyse whether the given statement - At the end of two half-lives, one-half of the original radioactive sample remains; at the end of three half-lives, one-third of the original sample remains, is true or not.
Concept Introduction:
Half-life is defined as a time required for decaying one-half part of any sample which is a radioactive material. Some elements are having isotopes that decay and disappear in a day while some can remain radioactive for billions of years. It can be calculated as below:
(d)
Interpretation:
To analyse whether the given statement - If the half-life of a particular radioactive sample is 12 minutes, a time of 36 minutes represnts three half-lives, is true or not.
Concept Introduction:
Half-life is defined as a time required for decaying one-half part of any sample which is a radioactive material. Some elements are having isotopes that decay and disappear in a day while some can remain radioactive for billions of years. It can be calculated as below:
(e)
Interpretation:
To analyse whether the given statement - At the end of three half-lives, only 12.5% of anoriginal radioactive sample remains, is true or not.
Concept Introduction:
Half-life is defined as a time required for decaying one-half part of any sample which is a radioactive material. Some elements are having isotopes that decay and disappear in a day while some can remain radioactive for billions of years. It can be calculated as below:
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Chapter 9 Solutions
Introduction to General, Organic and Biochemistry
- What are the two principal differences between nuclear reactions and ordinary chemical changes?arrow_forwardA sample of rock was found to contain 8.23 mg of rubidium-87 and 0.47 mg of strontium-87.. (a) Calculate the age of the rock if the half-life of the decay of rubidium by emission is 4.71010 y. (b) If some S3887r was initially present in the rock, would the rock be younger, older, or the same age as the age calculated in (a)? Explain your answer.arrow_forwardDefine the term half-life and illustrate it with an example.arrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage Learning
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
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