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The activity of a freshly prepared radioactive sample is 10^10 disintegrations per second, whose mean life is 10's. The mass of an atom of this radioisotope is 10^(-25) kg. The mass (in mg) of the radioactive sample is

Answer»

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Solution :`(d N)/(DT)=LAMBDA N`
`N=((d N)/(dt))/(lambda) =10^(10) XX 10^(9) =10^(19)"atoms"`
`m_("sample")=10^(-25) xx 10^(19)kg =1mg`


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