Nuclear fission

• What is nuclear fission?

  Nuclear fission is the splitting of a large and unstable nucleus into smaller nuclei, releasing energy.
• How does nuclear fission provide energy on Earth?

  Nuclear fission releases large amounts of energy when unstable nuclei split, which is harnessed for nuclear energy.
• What are the two ways nuclear fission can occur?

  Nuclear fission can occur spontaneously or by absorbing a neutron.
• Why is spontaneous fission rare?

  Spontaneous fission is rare because it occurs without external influence, making it less likely to happen.
• What is the role of neutrons in nuclear fission?

  Neutrons initiate the fission process by making the nucleus less stable, leading to its splitting.
• What happens after a neutron is absorbed by a large unstable nucleus like uranium-235?

  The nucleus becomes less stable, splits into two smaller nuclei, releases energy, and emits additional neutrons.
• What are the smaller nuclei produced from nuclear fission called?

  The smaller nuclei produced are called daughter nuclei.
• What type of radiation is released during nuclear fission?

  Gamma radiation is released during nuclear fission.
• What is a chain reaction in the context of nuclear fission?

  A chain reaction occurs when the fission of one nucleus triggers the fission of additional nuclei.
• What can happen if a nuclear fission chain reaction is not controlled?

  If uncontrolled, a chain reaction can lead to a massive release of energy, similar to a nuclear bomb.
• How is the rate of fission controlled in nuclear reactors?

  The rate of fission is controlled using control rods that absorb neutrons to slow down the reaction.
• What is the purpose of the energy released from nuclear fission in reactors?

  The energy released is used to heat water, turning it into steam to drive turbines connected to electricity generators.
• What are the pros of nuclear energy?

  The pros include relatively cheap fuel and a large, steady amount of energy produced without greenhouse gas emissions.
• What are the cons of nuclear energy?

  The cons include high construction costs, expensive waste disposal, and the risk of major disasters.
• Why do some people remain suspicious of nuclear energy?

  People are suspicious due to the potential risk of major disasters, despite the low likelihood of such events.