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Explain why atoms bigger than Fe cannot produce energy by fusion
• The binding energy per nucleon will decrease which is impossible unless external energy is supplied
Explain what is meant by induced nuclear fission
• a thermal neutron is absorbed by a nucleus resulting in then spliting into two daughter nuclei and me. Or more fast moving neutrons
Explain the purpose of using a moderator and control rods in the core of a nuclear reactor
• Moderator
- fission produces fast moving neutrons
- the Moderator slows down the fast moving neutrons as the neutrons collide with moderator material and lose some of the kinetic energy
- slow moving neutrons have more chance of causing fission
• control rods
- absorb neutrons
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