Sound & Ultrasound Quiz
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5 questions, one answer each
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1. What type of wave is sound?
- A. Transverse
- B. Longitudinal
- C. Electromagnetic
- D. Standing
2. What is the approximate upper limit of human hearing?
- A. 2000 Hz
- B. 20 000 Hz
- C. 200 000 Hz
- D. 20 Hz
3. A sound wave's amplitude is increased while its frequency stays the same. What changes?
- A. The pitch increases
- B. The pitch decreases
- C. The loudness increases
- D. The wave becomes transverse
4. An ultrasound pulse takes 0.0008 s to travel to a boundary and back through a medium where the wave speed is 1600 m/s. What is the distance to the boundary?
- A. 0.64 m
- B. 1.28 m
- C. 0.32 m
- D. 2.0 m
5. Why is ultrasound, rather than X-rays, often preferred for prenatal scanning?
- A. Ultrasound is a longitudinal wave and X-rays are not
- B. Ultrasound does not involve ionising radiation, unlike X-rays
- C. Ultrasound travels faster than X-rays
- D. Ultrasound can pass through a vacuum