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(A) The multiplication factor,denoted by $k$,is defined as the ratio of the number of neutrons present at a specific generation to the number of neutr

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$1$

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(A) The multiplication factor,denoted by $k$,is defined as the ratio of the number of neutrons present at a specific generation to the number of neutrons present in the preceding generation.When $k = 1$,the chain reaction is said to be in a 'critical' state,meaning the reaction rate is steady and self-sustaining.If $k If $k > 1$,the reaction is super-critical and will grow exponentially.Therefore,for a critical state,the value of the multiplication factor must be $1$.

$A$ nuclear reactor process is said to be critical when the value of the multiplication factor is .......

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