Discussion
A nuclear reactor is said to have become 'critical' when
Answer: D
A reactor is critical when it is ready to produce controlled energy.
Critical means the neutron multiplication factor \(k = 1\): exactly one neutron from each fission goes on to cause the next, so the chain reaction is self-sustaining at a steady rate. Below one it dies away; above one the power rises. The word carries no suggestion of danger.
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