plumiRelativistic particles: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 6.2.1.5 Relativistic particles, 2016–2025, with mark schemes and examiner’s reports where available.
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Open the full PDFYour answerQ5(d)(ii)
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All 13 questions on Relativistic particles, as a list
- June 2025, Paper 1, Q27 (1 mark): What is the total energy of a proton travelling at 50% the speed of light? 1.88 × 10–11 J A 1.51 × 10–10 J B 1.74 × 10–10 J C 2.01 × 10–10 J D Your answer [1]
- June 2024, Paper 1, Q12 (1 mark): The rest energy of an electron or positron is 0.511 MeV. When an electron and positron interact, they annihilate each other. What is the frequency of the two ph
- June 2024, Paper 2, Q5(d)(ii) (2 marks): Suggest and explain why the kinetic energy of the electron is lower after it has scattered from the nucleon. [2]
- June 2023, Paper 1, Q33(b) (2 marks): A much greater potential difference is used to accelerate electrons which reach a relativistic factor γ of 1.7. Calculate the accelerating potential difference.
- June 2022, Paper 1, Q40(c)(i) (3 marks): Calculate the de Broglie wavelength of the accelerated electron. Assume that the relativistic momentum of the electron accelerated through 50 kV is 1.2 × 10–22
- June 2022, Paper 1, Q40(c)(ii) (4 marks): Show that the velocity of an electron accelerated through 50 kV is about 1.2 × 108 m s–1. [4]
- November 2021, Paper 1, Q19 (1 mark): A muon of rest energy = 106 MeV is travelling at a speed of 0.99 c. The total energy of the muon is A 133 MeV B 249 MeV C 751 MeV D 5330 MeV [1] Your answer
- November 2021, Paper 1, Q41(a)(i) (2 marks): Calculate the maximum energy available when a free neutron decays into a proton and a β-particle. 1 u = 931 MeV energy = MeV [2]
- June 2019, Paper 1, Q34(a)(i) (2 marks): Show that the relativistic time dilation factor γ for these particles is less than 2. γ = [2]
- June 2019, Paper 1, Q34(a)(ii) (2 marks): Show that they are travelling at about 0.75 c. [2]
- June 2019, Paper 2, Q4(a)(ii) (3 marks): Explain whether it is reasonable to ignore relativistic effects in the calculation in (a)(i). Include a calculation in your explanation. [3]
- June 2018, Paper 2, Q5(b)(i) (4 marks): Show that the velocity of an electron accelerated through 1.5 × 108 V is very close to the velocity of light. rest energy of electron = 0.51 MeV [4]
- June 2017, Paper 2, Q6(b) (3 marks): The maximum total energy of the particles formed from the muon is about 106 MeV. Show that this suggests that the mass of the muon is about 200 times that of an
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