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1 g of Cs decays with a half life of 30 years . If the initial activity of Cs is 1.0 mc(millicurie) , find the number of atoms left after 5 years and the activity after 5 years. Avogadro number is 6.02*10^23 per mole.

1 g of Cs decays with a half life of 30 years . If the initial activity of Cs is 1.0 mc(millicurie) , find the number of atoms left after 5 years and the activity after 5 years. Avogadro number is 6.02*10^23 per mole.

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