Diffraction and interference Quiz
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5 questions, one answer each
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1. Water waves of wavelength 3 cm pass through four gaps of different widths. Which gap gives the greatest diffraction?
- A. 30 cm
- B. 10 cm
- C. 3 cm
- D. 100 cm
2. What happens to the wavelength of waves when they are diffracted through a gap?
- A. It increases
- B. It decreases
- C. It stays the same
- D. It becomes zero
3. Why can light not usually be seen bending round a door frame?
- A. Light is a longitudinal wave
- B. Light has a wavelength far smaller than the doorway
- C. Light travels too slowly
- D. Light cannot be diffracted at all
4. A crest meets a trough of equal size. What is the result?
- A. A crest twice as big
- B. A trough twice as big
- C. No change to either wave
- D. The displacements cancel
5. Which sound diffracts most strongly round a tall building?
- A. A high-pitched whistle
- B. A deep bass drum
- C. Both diffract equally
- D. Neither diffracts