5.2.4. Fission and fusion
A subsection of Physics, 5054, through 5. Nuclear physics
Listing 10 of 30 questions
Nuclear fusion is a reaction that occurs in the Sun and other stars. Explain what is meant by nuclear fusion. Describe the nuclear fusion reaction that takes place in the Sun. A star forms when the temperature of a large cloud of gas in space increases as the cloud collapses inwards. State the energy transfers that occur as the cloud collapses. The temperature increase starts a nuclear fusion reaction. Explain why the temperature of the star eventually reaches a steady value.
5054_w20_qp_21
THEORY
2020
Paper 2, Variant 1
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Uranium-235 (235 92 U) is the isotope of uranium that is used as the fuel in a nuclear power station. The isotope of uranium that is most abundant in nature is uranium-238 (238 92 U). State how a neutral atom of uranium-235 differs from a neutral atom of uranium-238. In the reactor of a nuclear power station, a nucleus of uranium-235 absorbs a slow-moving neutron and undergoes fission. State what happens to the nucleus of an atom during fission. Explain how fission can lead to a chain reaction in the reactor. State the purpose of the moderator in the reactor. Explain the action of the control rods in the reactor.
5054_w23_qp_21
THEORY
2023
Paper 2, Variant 1
View
Questions Discovered
30