Sound Quiz
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5 questions, one answer each
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1. What is the approximate range of frequencies that the human ear can detect?
- A. 20 Hz to 20,000 Hz
- B. 20 Hz to 2,000 Hz
- C. 200 Hz to 20,000 Hz
- D. 20,000 Hz to 200,000 Hz
2. Which statement best describes a longitudinal wave?
- A. Particles vibrate perpendicular to the direction of wave travel
- B. Particles vibrate parallel to the direction of wave travel, creating compressions and rarefactions
- C. The wave travels in a circular motion through the medium
- D. Particles only move horizontally across the surface of the medium
3. A student measures that sound takes 3.0 seconds to travel from a cliff and return as an echo. If the speed of sound in air is 340 m/s, what is the distance to the cliff?
- A. 340 m
- B. 510 m
- C. 1,020 m
- D. 680 m
4. Why does sound travel faster in solids than in gases?
- A. Solids are denser, so they contain more sound energy
- B. Particles in solids are closer together, allowing vibrations to be transmitted more quickly between particles
- C. Sound waves change into ultrasound when entering solids
- D. Solids have a higher frequency range than gases
5. A medical scanner uses ultrasound with a frequency of 5 MHz to scan soft tissue. Why is ultrasound preferred to audible sound for this application?
- A. Ultrasound has a lower frequency, so it does not damage living tissue
- B. Ultrasound travels faster through soft tissue than audible sound
- C. Ultrasound has a shorter wavelength, allowing it to reflect from smaller structures and produce detailed images of soft tissue
- D. Ultrasound cannot be reflected, so there is no risk of multiple echoes