Wave-particle duality Quiz
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5 questions, one answer each
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1. What is the de Broglie wavelength of a particle of mass 1.0 × 10⁻²⁶ kg moving at 5.0 × 10² m s⁻¹?
- A. 1.3 × 10⁻¹⁰ m
- B. 7.5 × 10⁹ m
- C. 3.3 × 10⁻³¹ m
- D. 1.3 × 10⁻⁸ m
2. The speed of a beam of electrons is doubled. What happens to the de Broglie wavelength?
- A. It doubles
- B. It stays the same
- C. It is quartered
- D. It halves
3. Which observation is evidence for the particle nature of light?
- A. Diffraction at a narrow slit
- B. Interference between two beams
- C. The photoelectric effect
- D. Reflection from a mirror
4. Why is a diffraction pattern with electrons evidence for wave behaviour?
- A. Electrons have a charge
- B. Diffraction is a property of waves
- C. Electrons have mass
- D. Electrons are emitted by metals
5. Why is peer review important?
- A. It makes the experiment cheaper
- B. It guarantees a result is correct forever
- C. Independent experts check the methods and conclusions
- D. It removes the need for repeat experiments