Sound Quiz
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5 questions, one answer each
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1. What is ultrasound?
- A. Sound below 20 Hz
- B. Sound above 20 000 Hz
- C. Any sound humans cannot hear
- D. Sound travelling through a vacuum
2. What is infrasound?
- A. Sound below 20 Hz
- B. Sound above 20 000 Hz
- C. Sound only found underwater
- D. Sound with no frequency
3. Which technique uses reflected ultrasound pulses to find the depth of the seabed?
- A. Foetal scanning
- B. Sonar
- C. Seismology
- D. Echolocation of the Earth's core
4. A sound wave crosses from air into water and speeds up. What happens to its frequency and wavelength?
- A. Both stay the same
- B. Frequency stays the same, wavelength increases
- C. Frequency increases, wavelength stays the same
- D. Both decrease
5. An ultrasound pulse takes 0.6 s to travel to the seabed and back at a speed of 1500 m/s. What is the depth?
- A. 900 m
- B. 450 m
- C. 250 m
- D. 1800 m