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 $10^{- 25} k g$ . The mass (in mg) of the radioactive sample is

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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} k g

. The mass (in mg) of the radioactive sample is

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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} k g

. The mass (in mg) of the radioactive sample is

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