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Physics

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Why will the escape of neutrons be proportionally less in a large piece of fissionable material than in a smaller piece?

  • Physics -

    escape is through surface, proportional to length squared
    volume generating neutrons is proportional to length cubed
    so
    ratio of escape to generation is proportional to 1/length, goes down as length goes up.

    This is why babies get cold in cold weather or hot in hot weather quicker than adults.

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