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(C) The neutron multiplication factor $K$ (also denoted as $k$) is defined as the ratio of the number of neutrons produced in a given generation to th

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$K=1$

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(C) The neutron multiplication factor $K$ (also denoted as $k$) is defined as the ratio of the number of neutrons produced in a given generation to the number of neutrons produced in the preceding generation.When $K = 1$,the rate of neutron production is equal to the rate of neutron loss,meaning the chain reaction is self-sustaining at a constant power level.This state is known as the critical state of a nuclear reactor.If $K If $K > 1$,the reactor is supercritical,and the power level increases exponentially.

The operation of a nuclear reactor is said to be critical when the value of the neutron multiplication factor $K$ is:

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