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किसी रेडियोएक्टिव पदार्थ की `t_1` तथा `t_2` समयों पर सक्रियाँ क्रमश: `R_1` तथा `R_2` है। सिद्ध कीजिए की पदार्थ का श्ये नियंतक `lamda=(log_e(R_1//R_2))/((t_1-t_2))`.

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रदरफोर्ड-सदी नियम से, `R_1=R_(0)e^(-lamdat_(1))`, `R_2=R_0""e^(-lamdat_(2))`,

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