Physics- Nuclear fission page 57 0.0 / 5 ? PhysicsNuclear fissionGCSEEdexcel Created by: emj790Created on: 26-01-17 20:04 What is nuclear fission? The splitting up of big atomic nuclei 1 of 20 Nuclear fission is a type of what? Nuclear reaction 2 of 20 What does nuclear fission release? A lot of energy 3 of 20 What atoms does it use? Uranium or plutonium 4 of 20 What is fired at what? A neutron at a large, unstable nucleus 5 of 20 What happens because of this? The atom becomes more unstable and causes it to split 6 of 20 What is formed? Two daughter nuclei 7 of 20 Give an example of what Uranium splits into Barium, Krypton and three neutron 8 of 20 What is special about these nuclei? They are radioactive 9 of 20 What could happen; concerning the neutrons? They can hit other uranium nuclei which can split and release more neutrons etc. 10 of 20 Therfore what is this reaction? A chain reaction 11 of 20 What could happen if more than one neutron is released It can become an uncontrolled reaction 12 of 20 Chain reactions in reactors must be what? Carefully controlled 13 of 20 What are control rods for? To absorb the extra neutrons so that the reaction is controlled 14 of 20 What does the moderator do? It makes the reaction take place by slowing down the neutrons so that it can hit the nuclei 15 of 20 How can control rods control the rate of reaction? It can be raised or lowered 16 of 20 What does this create? A steady rate of nuclear fission (one neutron per reaction continues) 17 of 20 What is an example of a controlled chain reaction A nuclear power station 18 of 20 What does the energy do to make electricity? It turns to heat energy, which heats up water, which turns into steam, which turns a turbine, which turns a generator 19 of 20 Name the different types of energy used Heat, kinetic and electrical 20 of 20
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