A radioactive sample contains 2.2 mg of pure carbon which has half life period of 1224 s. calculate

A radioactive sample contains 2.2 mg of pure carbon which has half life period of 1224 s. Calculate the number of atoms present initially. The activity when 5 micro grams of the sample will be left. Please help me to solve this sum
sowmiya
Asked Nov 24, 2014

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