Every individual fission of a U235 nucleus releases approximately how many fast neutrons________________?
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Answer: D. 2 — neutrons
Explanation
Splitting a uranium nucleus releases an average of two to three energetic neutrons into the surroundings. These newly liberated fast neutrons are essential for striking nearby fissile atoms to sustain reactions. Experimental measurements confirm that a single fission event always generates multiple prompt neutron particles. Neutrons are subatomic particles carrying no electrical charge located inside atomic nuclei alongside protons. Fast neutrons possess high kinetic energy levels exceeding one megaelectronvolt immediately after their release. The average number of released neutrons per fission is designated by the scientific symbol nu.
Releasing multiple neutrons per event enables the chain reactions required for stable nuclear reactor operations. Reactor physicists must carefully account for neutron populations to maintain safe and stable power generation levels. Excess neutrons beyond what sustains the chain reaction can be captured using specialized control rods. Releasing only a single neutron would be insufficient to maintain a self-sustaining nuclear chain reaction. An infinite number of neutrons violates basic conservation laws regarding mass and subatomic particle counts. Options suggesting fractional neutron counts misinterpret statistical averages derived from large populations of fissions.
- Subject
- Engineering
- Category
- Mechanical Engineering
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- —
- Difficulty
- medium
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