H2P-563

Activity and decay constant

H2 Physics · JC 2 · Medium · Activity and decay constant

A sample of radioactive nuclei has an activity of

4.0\times10^{5}\,\text{s}^{-1}

. The decay constant of the nuclide is

2.0\times10^{-3}\,\text{s}^{-1}

. Using

A = \lambda N

, calculate the number of undecayed nuclei in the sample.

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