IGCSE Physics Specification

Edexcel 4PH1

Section 7: (c) Fission and fusion

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#7.17

know that nuclear reactions, including fission, fusion and radioactive decay, can be a source of energy

#7.18

understand how a nucleus of U-235 can be split (the process of fission) by collision with a neutron, and that this process releases energy as kinetic energy of the fission products

#7.19

know that the fission of U-235 produces two radioactive daughter nuclei and a small number of neutrons

#7.20

describe how a chain reaction can be set up if the neutrons produced by one fission strike other U-235 nuclei

#7.21

describe the role played by the control rods and moderator in the fission process

#7.22

understand the role of shielding around a nuclear reactor

#7.23

explain the difference between nuclear fusion and nuclear fission

#7.24

describe nuclear fusion as the creation of larger nuclei resulting in a loss of mass from smaller nuclei, accompanied by a release of energy

#7.25

know that fusion is the energy source for stars

#7.26

explain why nuclear fusion does not happen at low temperatures and pressures, due to electrostatic repulsion of protons