Physics · Unit 1 · Ionising radiation and nuclear reactions · Nuclear model and stability
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A uranium-235 nucleus absorbs a slow-moving neutron and undergoes fission, producing barium-141, krypton-92, and additional particles. What key feature of this reaction enables a sustained chain reaction?
A neutron with low energy collides with a nucleus of uranium-235. Explain what occurs within the nucleus in terms of the neutron and resulting fission products, including why multiple neutrons are released.
A uranium-235 nucleus absorbs a thermal neutron and splits into two smaller nuclei. Explain how this process results in the release of extra neutrons and why many such reactions can lead to a chain reaction.
A uranium-235 nucleus absorbs a slow-moving neutron and undergoes fission, producing barium-141, krypton-92, and additional neutrons. Explain how this neutron-induced fission reaction can lead to a chain reaction in terms of the neutrons produced.