(a)
Interpretation:
The fraction of Sr-90 remains after three half-lives needs to be determined, if the half-life of Sr-90 is 29 years.
Concept introduction:
The nuclear reactions are a type of chemical processes which lead to the formation of some new nuclei with the emission of certain particles. Usually alpha or beta particles, or gamma rays are emitted as a side product with some new daughter nuclei. The nuclei which shows spontaneous decay with time are called as radioactive nuclei. The radioactive decay follows the first order kinetic and the half-life is inversely proportional to the decay constant of the radioactive decay.
(b)
Interpretation:
Thevalue of decay constant needs to be determined, if the half-life of Sr-90 is 29 years.
Concept introduction:
The nuclear reactions are a type of chemical processes which lead to the formation of some new nuclei with the emission of certain particles. Usually alpha or beta particles, or gamma rays are emitted as a side product with some new daughter nuclei. The nuclei which shows spontaneous decay with time are called as radioactive nuclei. The radioactive decay follows the first order kinetic and the half-life is inversely proportional to the decay constant of the radioactive decay.
(c)
Interpretation:
The years required for 99% of the Sr-90 to disappear needs to be determined.
Concept introduction:
The nuclear reactions are a type of chemical processes which lead to the formation of some new nuclei with the emission of certain particles. Usually alpha or beta particles, or gamma rays are emitted as a side product with some new daughter nuclei. The nuclei which shows spontaneous decay with time are called as radioactive nuclei. The radioactive decay follows the first order kinetic and the half-life is inversely proportional to the decay constant of the radioactive decay.
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CHEMISTRY-MOD.MASTERING (18W)
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