In order for a chain reaction to be self-sustaining, there must be sufficient nuclear material present, and it must be in an appropriate physical configuration.

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Quizplus · Accepted Answer

This is because a self-sustaining chain reaction requires a critical mass of nuclear material to maintain the reaction rate, and the material must be arranged in a way that allows for fission events to occur and for neutrons to be captured by other nuclei. Without these conditions, the chain reaction would not be able to continue indefinitely.

In Order for a Chain Reaction to Be Self-Sustaining, There