Wave-particle duality and de Broglie wavelength Quiz
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5 questions, one answer each
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1. A particle has momentum 2.0 × 10⁻²⁴ kg m s⁻¹. What is its de Broglie wavelength?
- A. 3.3 × 10⁻¹⁰ m
- B. 1.3 × 10⁻⁵⁸ m
- C. 3.0 × 10⁹ m
- D. 3.3 × 10⁻⁹ m
2. Which observation shows that electrons can behave as waves?
- A. They are deflected in an electric field
- B. They produce a diffraction pattern with a crystal
- C. They have a negative charge
- D. They produce light in a fluorescent screen
3. The speed of an electron beam is doubled. What happens to the de Broglie wavelength?
- A. It doubles
- B. It is multiplied by four
- C. It is halved
- D. It is unchanged
4. In an electron diffraction tube the accelerating potential difference is raised. What happens to the pattern?
- A. Rings get larger
- B. Rings disappear
- C. Rings get smaller
- D. Rings become brighter only
5. Why is the wave nature of a cricket ball not observed?
- A. It has no wavelength
- B. Its wavelength is very small compared with any gap
- C. Its wavelength is very large
- D. Balls cannot be diffracted