Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
Nuclear reactions as a source of energy
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
4 marks · Normal
Answer and see the solution →This question is about nuclear fission in uranium-235.
(a)[1 mark]State the meaning of the term 'fission' as used in nuclear physics.
(b)[2 marks]Describe what happens when a uranium-235 nucleus absorbs a slow-moving neutron.
(c)[1 mark]Name the type of energy released as a direct result of the fission reaction.
Question 2
3 marks · Normal
Answer and see the solution →In the fission of uranium-235, different numbers of neutrons can be released depending on the fission event. The table below shows data from five fission events.
Number of neutrons released in five different uranium-235 fission events. Fission event Number of neutrons released 1 2 2 3 3 3 4 2 5 4 (a)[2 marks]Calculate the average number of neutrons released per fission event in this sample.
(b)[1 mark]Explain why the actual number of neutrons released per fission can vary between events.
Question 3
1 mark · Normal
Answer and check →Which of the following is NOT a product of uranium-235 fission?
- A.barium-144
- B.krypton-89
- C.proton
- D.neutron
Question 4
2 marks · Normal
Answer and see the solution →Name and briefly describe the function of two components used to control the rate of fission reactions in a nuclear reactor.
Question 5
3 marks · Normal
Answer and see the solution →Explain why shielding is needed around a nuclear reactor. Give two reasons.
Question 6
3 marks · Normal
Answer and see the solution →Describe how a chain reaction is produced in a nuclear reactor using uranium-235.
Question 7
4 marks · Normal
Answer and see the solution →Consider the following nuclear fission equation for uranium-235:
Answer the following questions about it.
(a)[1 mark]How many neutrons are produced in this fission reaction?
(b)[3 marks]Verify that both mass and atomic numbers are conserved on both sides of the equation.
Question 8
3 marks · Normal
Answer and see the solution →Some of the energy released in nuclear fission leaves the reactor as electromagnetic radiation. Explain why most of the energy from fission comes from the kinetic energy of the products rather than from electromagnetic radiation.