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Why does a chain reaction occurs when uranium-235 undergoes fission?

April 26, 2017chain fission occurs REACTION undergoes uranium-235

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Why does a chain reaction occurs when uranium-235 undergoes fission?

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The energy released by the fission, then provides the energy to create more fission in the U-235. If at least one neutron from U-235 fission strikes another nucleus and causes it to fission, then the chain reaction will continue. If the reaction will sustain itself, it is said to be “critical”.