P2.6 3.0 / 5 based on 1 rating ? PhysicsGCSEAQA Created by: Phoebe TaylorCreated on: 07-05-13 19:41 Tracers are normally what particles? Gamma 1 of 13 What alpha particles are used in smoke detectors? Americum-241 2 of 13 Nuclear fission is where the nucleus is split. What is it split by and what is released when split, potentially causing a chain reaction? Neutron 3 of 13 What is the critical mass in a nuclear fission reaction? Minimum amount needed to sustain a chain reaction 4 of 13 Why is energy released in nuclear fusion? The new nucleus has less mass than the original 5 of 13 What do the conditions need to be like for nuclear fusion? High temperature, high pressure 6 of 13 The simplest nuclear fusion equation is... Hydrogen > helium + energy 7 of 13 To form a main sequence/protostar, what does gravity pull together? Dust, hydrogen atoms and gases 8 of 13 The next two stars for main sequence stars the same mass of our sun are... Red Giant Star and Black Dwarf 9 of 13 The next star for main sequence stars bigger than our sun is... Red Supergiant Star 10 of 13 After this, the core collapses and heats so quickly, the outer layers explode in a... Supernova explosion 11 of 13 If the remnant from this is small, it'll form a... Neutron Star 12 of 13 If the remnant from that is large, it'll form a... Black hole 13 of 13
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