Lesson 3.2.2.4

3.2.2.4 Wave-particle duality Quiz: AQA Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson 3.2.2.4, Wave-particle duality: 20 multiple choice questions for the AQA Physics (7408), Unit 2: Particles and radiation, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. What does electron diffraction suggest about particles?

    • Particles are always at rest
    • Particles have no momentum
    • Particles cannot be diffracted
    • Particles possess wave properties

  2. What does the photoelectric effect suggest about electromagnetic waves?

    • They are always longitudinal
    • They have a particulate nature
    • They cannot transfer energy
    • They travel slower than sound

  3. What is the de Broglie wavelength formula?

    • λ = h/(mv)
    • λ = h/(mv^2)
    • λ = hmv
    • λ = mv/h

  4. If the momentum of an electron increases, what happens to its de Broglie wavelength?

    • It doubles
    • It stays the same
    • It decreases
    • It increases

  5. Which experiment gives evidence for the wave nature of electrons?

    • Photoelectric effect
    • Compton scattering
    • Electron diffraction
    • Rutherford scattering

  6. What is the de Broglie wavelength of an electron moving at 1.0 × 10^6 m/s? Use m = 9.11 × 10^-31 kg.

    • 7.3 × 10^-7 m
    • 1.5 × 10^-9 m
    • 6.6 × 10^-28 m
    • 7.3 × 10^-10 m

  7. A proton (m = 1.67 × 10^-27 kg) moves at 1.0 × 10^6 m/s. What is its de Broglie wavelength?

    • 4.0 × 10^-13 m
    • 4.0 × 10^-10 m
    • 4.0 × 10^-16 m
    • 7.3 × 10^-10 m

  8. If the momentum of a particle is doubled, what happens to its de Broglie wavelength?

    • It stays the same
    • It halves
    • It becomes a quarter
    • It doubles

  9. An electron is accelerated through 100 V from rest. What is its de Broglie wavelength? Use m = 9.11 × 10^-31 kg and e = 1.6 × 10^-19 C.

    • 1.2 × 10^-10 m
    • 1.2 × 10^-13 m
    • 1.2 × 10^-7 m
    • 3.9 × 10^-10 m

  10. A particle has a de Broglie wavelength of 1.0 × 10^-10 m. What is its momentum?

    • 6.6 × 10^-34 kg m s^-1
    • 6.6 × 10^-14 kg m s^-1
    • 1.5 × 10^-24 kg m s^-1
    • 6.6 × 10^-24 kg m s^-1

  11. What is the momentum of a photon of wavelength 500 nm?

    • 1.3 × 10^-27 kg m s^-1
    • 1.3 × 10^-18 kg m s^-1
    • 2.0 × 10^-27 kg m s^-1
    • 6.6 × 10^-34 kg m s^-1

  12. Why does electron diffraction become more pronounced as momentum decreases?

    • The electrons become more massive
    • The wavelength increases, so it becomes comparable to the spacing of the diffracting structure
    • The wavelength falls to zero
    • The electric charge increases

  13. An electron and a proton have the same speed. What is the ratio of the electron's wavelength to the proton's wavelength?

    • about 1840
    • 1
    • about 40
    • about 1/1840

  14. An electron is accelerated through 1.0 kV from rest. What is its de Broglie wavelength?

    • 1.2 × 10^-13 m
    • 3.9 × 10^-11 m
    • 1.2 × 10^-10 m
    • 3.9 × 10^-8 m

  15. An electron and a photon have the same wavelength. What is the ratio of the electron's momentum to the photon's momentum?

    • 2
    • 0.5
    • 1
    • 1836

  16. Which observation in the photoelectric effect supports the particle nature of light?

    • Emission depends on frequency and a threshold, not on intensity
    • Emission rate depends on light intensity alone
    • Electrons are emitted after a delay at low intensity
    • Electrons are emitted at all frequencies when intensity rises

  17. What is the de Broglie wavelength of a 0.1 kg ball moving at 10 m/s?

    • 6.6 × 10^-32 m
    • 1.0 × 10^-34 m
    • 6.6 × 10^-30 m
    • 6.6 × 10^-34 m

  18. Why is the wave-particle duality model regarded as provisional?

    • Because electrons are never observed directly
    • New evidence must be peer reviewed and validated by the scientific community
    • Because the Planck constant is not fixed
    • Because diffraction cannot be measured

  19. What speed must an electron have for its de Broglie wavelength to be 0.1 nm? Use m = 9.11 × 10^-31 kg.

    • 7.3 × 10^6 m/s
    • 7.3 × 10^9 m/s
    • 7.3 × 10^3 m/s
    • 2.2 × 10^8 m/s

  20. In the de Broglie formula, what does the product mv represent?

    • The force acting on the particle
    • The kinetic energy of the particle
    • The momentum of the particle
    • The angular momentum of the particle

All AQA Physics quizzes