Karteikarten
Nuclear Fission and Fusion
Karten in diesem Stapel (11)
- 1what is nuclear fission?Nuclear fission is the SPLITTING of an atomic nucleus
- 2what is nuclear FUSION?the joining of two atomic nuclei to form a larger one
- 3what are the two fissionable substances in common use in nuclear reactors?uranium 235 and plutonium 239
- 4what must happen to the radioactive atom before fission can occur?the nucleus must first absorb a neutron
- 5what happens to the nucleus undergoing fission?the addition of the neutron makes the nucleus unstable causing it to split.
the nucleus undergoing fission splits into two smaller nuclei and two or three neutrons and energy is released. - 6what is a chain reaction?
- 7how is energy released in stars?by nuclear fusion
- 8what conditions are needed for stars to form?enough dust and gas from space is pulled together by gravitational attraction.
- 9how are planets formed?smaller than stars, masses may form and be attracted to a larger mass to become planets
- 10why is a star stable during the 'main sequence' period of its lifethe forces within it are balanced
- 11a stars life cycle is determined by what?its size
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- gcse physics Karteikarten am Nuclear Fission and Fusion, erstellt von Ella Wolf am 13/05/2013.
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- Ella Wolf
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