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A sample of radioactive material has a m...

A sample of radioactive material has a mass m, decay constant `lamda` and molecular weight M. Avogadro constant `N_A`. (a) Find the initial activity of the samples (b) the activity of the substance after t sec

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The correct Answer is:
(a) `(lamdamN_A)/M ` (b) `((mN_Alamda)/M) e^(-lamdat)`
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