C.2 Wave model Quiz
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5 questions, one answer each
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1. A wave has frequency 50 Hz and wavelength 4.0 m. Its speed is:
- A. 12.5 m s⁻¹
- B. 54 m s⁻¹
- C. 200 m s⁻¹
- D. 0.080 m s⁻¹
2. Which of these is a longitudinal wave?
- A. Light
- B. Sound in air
- C. A wave on a guitar string
- D. A radio wave
3. Which is true of all electromagnetic waves in a vacuum?
- A. They have the same frequency
- B. They have the same wavelength
- C. They travel at the same speed
- D. They are longitudinal
4. Sound passes from air into water. Which quantity stays the same?
- A. Speed
- B. Wavelength
- C. Frequency
- D. All three
5. Which feature distinguishes mechanical waves from electromagnetic waves?
- A. Only mechanical waves transfer energy
- B. Mechanical waves need a medium
- C. Only mechanical waves can be reflected
- D. Mechanical waves are always longitudinal