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`beta`-क्षय ट्राइटियम की अर्द्ध-आयु 12.5 वर्ष है | 25 वर्ष बाद ट्राइटियम के एक नमूने का कितना अंश अविघटित रहेगा ?

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`T_(1//2)=12.5" वर्ष, "t=25" वर्ष"`
`N=N_(0)((1)/(2))^(n)`
`(N)/(N_(0))=((1)/(2))^(n)=((1)/(2))^((t)/(T_(1//2)))=((1)/(2))^((25)/(12.5))=((1)/(2))^(2)=(1)/(4)`
अत: `(1)/(4)` भाग अविघटित रहेगा |

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