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(A) The multiplication factor $(K)$ is defined as the ratio of the rate of production of neutrons to the rate of loss of neutrons.$K = \frac{	ext{Rat

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(A) The multiplication factor $(K)$ is defined as the ratio of the rate of production of neutrons to the rate of loss of neutrons.$K = \frac{	ext{Rate of production of neutrons}}{	ext{Rate of loss of neutrons}}$When $K = 1$,the chain reaction is self-sustaining at a constant level,and the reactor is said to be in a 'critical' state.If $K > 1$,the reaction is supercritical,leading to an exponential increase in power (potentially causing an explosion).If $K Therefore,for a critical reactor,$K = 1$.

The operation of a nuclear reactor is said to be critical if the multiplication factor $(K)$ has a value of:

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