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The half life of ._92^238U undergoing alpha-decay is 4.5xx10^9 years. The activity of 1 g sample of ._92^238U is |
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Answer» `1.23xx10^4` Bq `=4.5xx10^9xx3.16xx10^7=1.42xx10^17` s One kmol of any isotope CONTAINS Avogadro's NUMBER of ATOMS, so 1G of `._92^238U` contains `=1/(238xx10^(-3))"kmol"xx6.025xx10^26` atoms per kmol `=25.3xx10^20` atoms Activity, R=`lambdaN` `=0.693/T_(1//2) N =(0.693xx25.3xx10^20)/(1.42xx10^17)s^(-1)` `=1.23xx10^(4) s^(-1) =1.23xx10^4` Bq |
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