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Consider a radioactive nucleus A which decays to a stable nucleus C through the following sequence
`A to B to C`
Here B is an intermediate nuclei which is also radioactive. Considering that there are `N_(0)` atoms of A initially , plot the praph showing the variation of number of atoms of A and B versus time.

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Consider the situation shown in the graph.
image
At `t= 0 , N_(A) =N_(0)` (maximum) while `N_(B) =0`. As time increases `N_(A)` decreases exponentially and the number of atoms of B increases. They becomes `(N_(B))` maximum and finally drop to zero exponenetially by radioactive decay law.

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