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(92)^(238)"U"
की अर्द्ध-आयु `alpha` - कण क्र विरुद्ध `1.5xx10^(17)` सेकंड है | `""_(92)^(238)"U"` के एक नमूने जिसमें `2.5xx10^(20)` परमाणु हैं, की सक्रियता क्या है ?

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(b) `lambda=(0.6391)/(T_(1//2))impliesR=lambdaN=(0.6931)/(1.5xx10^(17))xx25xx10^(20)`
`=11552"s"^(-1)`

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