activity hard

Question

Activity A of sample defined as:

RankGuru · Accepted Answer

The activity ($A$) of a radioactive sample is the number of disintegrations (decays) occurring per unit time. Mathematically, it is the magnitude of the rate of change of the number of nuclei: $A = |dN/dt|$. Since $dN/dt = -\lambda N$, the activity is also expressed as $A = \lambda N$, where $\lambda$ is the decay constant and $N$ is the number of radioactive nuclei present.

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activity hard

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