Lesson 3.2.1.3

3.2.1.3 Particles, antiparticles and photons Quiz: AQA Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.1.3, Particles, antiparticles and photons: 20 multiple choice questions for the AQA Physics (7408), Unit 2: Particles and radiation, written with Revision Ninja.

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The 20 questions

  1. What is the antiparticle of the electron?

    • antiproton
    • neutrino
    • positron
    • proton

  2. What is the antiparticle of the neutrino?

    • antineutrino
    • antiproton
    • neutron
    • positron

  3. In the photon model, what is the energy of a photon of frequency f?

    • hf^2
    • f/h
    • hf
    • h/f

  4. What is the approximate value of the Planck constant?

    • 6.63 × 10^-34 J s
    • 3.00 × 10^8 J s
    • 6.63 × 10^-19 J s
    • 1.60 × 10^-19 J s

  5. What is produced when an electron and a positron annihilate at low energy?

    • Two electrons moving apart
    • A proton and a neutron
    • Two gamma photons moving in opposite directions
    • One gamma photon at rest

  6. What is the minimum photon energy needed for pair production of an electron-positron pair?

    • about 0.51 MeV
    • about 10.2 MeV
    • about 2.04 MeV
    • about 1.02 MeV

  7. How does a positron compare with an electron?

    • Opposite mass, same charge
    • Same mass, same charge
    • Half the mass, same charge
    • Same mass, opposite charge

  8. What is the energy of a photon of wavelength 500 nm, using h = 6.63 × 10^-34 J s and c = 3.0 × 10^8 m/s?

    • 4.0 × 10^-31 J
    • 4.0 × 10^-19 J
    • 4.0 × 10^-13 J
    • 4.0 × 10^-25 J

  9. A photon has energy 3.0 × 10^-19 J. What is its frequency, using h = 6.63 × 10^-34 J s?

    • 4.5 × 10^-15 Hz
    • 2.0 × 10^15 Hz
    • 2.0 × 10^14 Hz
    • 4.5 × 10^14 Hz

  10. Each photon from slow electron-positron annihilation has energy 0.511 MeV. What is its frequency?

    • 2.4 × 10^20 Hz
    • 1.2 × 10^14 Hz
    • 6.1 × 10^19 Hz
    • 1.2 × 10^20 Hz

  11. What is the rest energy of an electron in MeV?

    • 51 MeV
    • 5.1 MeV
    • 0.0051 MeV
    • 0.51 MeV

  12. What is the charge on an antiproton?

    • 0
    • +2 e
    • -1 e
    • +1 e

  13. Which particle has the same mass as the proton but opposite charge?

    • antiproton
    • positron
    • antineutron
    • neutron

  14. A photon of energy 2.0 MeV produces an electron-positron pair. What total kinetic energy is shared between the pair?

    • 2.00 MeV
    • 1.02 MeV
    • 0.98 MeV
    • 0.49 MeV

  15. Why must pair production take place near a nucleus?

    • To conserve momentum
    • To change the nucleus into a neutron
    • To increase the photon wavelength
    • Because a nucleus emits the positron

  16. Gamma photons from annihilation have frequency 1.2 × 10^20 Hz. What is their wavelength?

    • 2.4 × 10^-12 m
    • 2.4 × 10^-9 m
    • 4.1 × 10^-12 m
    • 2.4 × 10^-15 m

  17. What is the energy of a 0.511 MeV photon in joules?

    • 1.6 × 10^-14 J
    • 8.2 × 10^-13 J
    • 8.2 × 10^-14 J
    • 8.2 × 10^-16 J

  18. What is the total energy of the two photons from electron-positron annihilation at rest?

    • 8.2 × 10^-14 J
    • 3.3 × 10^-13 J
    • 1.6 × 10^-13 J
    • 1.6 × 10^-19 J

  19. Which expression gives the wavelength of a photon of energy E?

    • h/Ec
    • E/hc
    • hc/E
    • Ehc

  20. Which conservation law explains why electron-positron annihilation at rest produces two photons rather than one?

    • Conservation of baryon number
    • Conservation of charge
    • Conservation of momentum
    • Conservation of lepton number

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