Flashcards
nuclear fission and fusion-additional-physics
Flashcards do conjunto (11)
- 1Definition of nuclear fissionSplitting up of big atomic nuclei
- 2How is it nuclear fission used?Used to generate electricity using nuclear reactors. A controlled chain reaction takes place in which atomic nuclei split up and release heat. This heats water for steam which then turns a turbine
- 3What fuel is usually used in nuclear fission?uranium-235 or plutonium-239
- 4Info on nuclear reactor fission:-reactor is surrounded by a large concrete container to absorb some heat and to control it
-control rods keep chain reaction under control
-coolant cools down system using water
-moderator slows down neutrons to create more fission events - 5What are the safety issues regarding nuclear fission?-chain reaction can become uncontrollable
-it produces radioactive waste which is difficult and expensive to dispose - 6Explain how chain reactions happen in nuclear fission-when nuclear fission happens a slow moving electron is absorbed into the uranium or plutonium nucleus. This makes the nucleus unstable
-this causes it to split and spit out 2 or 3 neutrons
-this could then lead to being absorbed into another nucleus and therefore keeping the reaction going - 7Definition of nuclear fusionThe joining of small atomic nuclei. This is when the two light nuclei e.g hydrogen join to create a larger nucleus
- 8Conditions needed for nuclear fusion?-very high temperature
-high pressure
-if these are not high enough they repel each other - 9How much energy does nuclear fusion create?Lots of energy. More then fission . People are trying to develop reactors for it to create electricity
- 10Why can't nuclear fusion be used yet for generating electricity?- requires extremely high temperatures (around 10,000,000 decree c) to fuse
- the high pressure and temps means that it cannot be held in normal containers - 11Where does nuclear fusion happen in nature?The stars
Informações
- Descrição
- nuclear fission chain reactions nuclear fusion
- Criado por
- Aimee Shanks
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