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(A) radioactive series consists of a sequence of radioactive decays where a parent nucleus decays into a daughter nucleus,which then decays further un

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zero

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(A) radioactive series consists of a sequence of radioactive decays where a parent nucleus decays into a daughter nucleus,which then decays further until a stable nucleus is reached.By definition,the end product of a radioactive series is a stable nucleus.$A$ stable nucleus does not undergo radioactive decay.The decay constant $\lambda$ is defined as the probability of decay per unit time.Since a stable nucleus does not decay,its decay constant is $0$.

The decay constant of the end product of a radioactive series is

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