Nuclear reactions- fission, fusion and chain reactions.

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1. Why is fusion difficult?

  • Nuclei have to be really close before it occurs, and as unless really high temperatures and pressures are reached to overcome this, the positive charges repel one another
  • Trick question!
  • Because scientists haven't yet figured out how it works
  • Nuclei may blow up if they get to the correct heat and pressure for fusion,so there is a low chance of them being able to fuse
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Other questions in this quiz

2. What's a chain reaction?

  • when in a fission reaction nuclei are formed, neutrons released in the reaction undergo fission
  • when in a fission reaction the nucleus is formed, it splits and comes back together again
  • when in a fission reaction nuclei are formed, the energy released stimulates other nuclei to undergo a fission reaction
  • I can't see a link to physics

3. In 1989 scientists said they made fusion happen at 50 degrees celsius. Why?

  • there isn't any proof they did, so their experiments aren't valid. They could've lied or pulled of something really amazing but we'll never know.
  • other
  • because the experiment took place at the bottom of the ocean
  • because the experiment took place in space

4. If a chain reaction isn't controlled-

  • there'll be a nuclear explosion
  • it prevents any of these other options
  • living things will become ill
  • there will be a risk of fire

5. Why isn't fusion a casual source of energy?

  • To produce the correct heat and pressure needed for fusion on Earth, it uses more energy than it makes
  • It's only a hypothetical idea
  • Because it doesn't produce any
  • It can currently occur in space only and can't be taken to Earth

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