Nuclear reactions- fission, fusion and chain reactions.

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1. What's a chain reaction?

  • when in a fission reaction nuclei are formed, neutrons released in the reaction undergo fission
  • I can't see a link to physics
  • 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
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Other questions in this quiz

2. Only one neutron from each _____ can cause another _____

  • atom
  • fission
  • chain reaction
  • fusion

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

  • because the experiment took place in space
  • 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.
  • because the experiment took place at the bottom of the ocean
  • other

4. Why is fusion difficult?

  • Trick question!
  • Because scientists haven't yet figured out how it works
  • 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
  • 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

5. What kind of fusion was said by some scientists to have occurred in low temperatures?

  • Cold fusion
  • Who snows? (this is why we can't have nice things)
  • Ice fusion
  • No heat fusion

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