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`""_(92)^(238)"U"` नाभिक, जिसमें अल्फा क्षय-हो रहा है, कि अर्द्ध-आयु `4.5xx10^(9)` वर्ष है | `""_(92)^(238)"U"` नाभिक के 10 ग्राम नमूने कि सक्रियता ज्

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`""_(92)^(238)"U"` नाभिक, जिसमें अल्फा क्षय-हो रहा है, कि अर्द्ध-आयु `4.5xx10^(9)` वर्ष है | `""_(92)^(238)"U"` नाभिक के 10 ग्राम नमूने कि सक्रियता ज्ञात कीजिए | एक ग्राम `""_(92)^(238)"U"` में `25.3xx10^(20)` परमाणु हैं |
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Correct Answer - `1.24xx10^(5)` बैकेरल
`R=lambdaN=(0.6931)/(T_(1//2))`
`N=(0.6931xx10xx25.3xx10^(20))/(4.5xx10^(9)xx365xx24xx60xx60)`.
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