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[" (3) "2times10^(-10)Bq],[" The activit...

[" (3) "2times10^(-10)Bq],[" The activity of a freshly prepared radioactive sample "],[" is "10^(10)" disintegrations per second,whose mean "],[" life is "10^(9)s" .The mass of an atom of this "],[" radioisotope is "10^(-25)kg" .The mass (in mg) of the "],[" radioactive sample is "],[[" (1) "1mg," (2) "2mg]]

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