In a thermal nuclear reactor, maintaining a controlled, steady chain reaction is crucial.
Which statement is correct?
The moderator is designed to absorb excess neutrons to prevent a runaway reaction.
Control rods are used to slow down fast neutrons to increase the probability of fission.
On average, exactly one neutron produced per fission reaction must initiate a further fission to maintain a constant power output.
Fast-moving neutrons are more likely to cause induced fission in 92235U^{235}_{92}\text{U}92235U than thermal neutrons.
128 exam-style questions on AQA A Level Physics Radioactivity (A-level only), covering Rutherford scattering (A-level only), $\alpha$ , $\beta$ and $\gamma$ radiation (A-level only), Radioactive decay (A-level only), Nuclear instability (A-level only), Nuclear radius (A-level only), Mass and energy (A-level only), Induced fission (A-level only), and Safety aspects (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.