Physical Science, Chapter 18 (Part 2)

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Across
  1. 3. Sound waves are transmitted by alternating regions of high and low__________ densities. (p. 420)
  2. 5. The ear converts vibrations into electrical impulses in the _____________.(p. 427)
  3. 8. During speaking or singing, the vocal cords tighten and the ____________ is partially closed. (p. 425)
  4. 9. Robert Boyle demonstrated that sound needs a medium through which to travel when he found that an alarm watch inside a___________ did not make a sound. (p. 421)
  5. 10. The three bones of the middle ear are important for___________, but do not help to maintain a person's sense of balance. (p. 427)
  6. 12. Ultrasound technology is used to______________ and sometimes even treat disease. (p. 434)
  7. 15. The difference between the same note played on a clarinet and on a trumpet is its___________. (p. 423)
  8. 17. Children can hear higher pitches than adults can because they can hear higher_______________. (p. 422)
  9. 18. _____________ waves have frequencies greater than 20,000 Hz. (p. 434)
  10. 20. The___________ a sound travels is affected by the density and pressure, the stiffness, and the temperature of the medium in which it travels, but not the direction that the waves travels.(pp.421-22)
  11. 22. Using sound waves to measure the distance to a sound-reflecting surface is known as _________________ (p. 431)
Down
  1. 1. The ___________ ear helps us determine the direction of a sound's source? (p. 427)
  2. 2. The____________ controls the volume of air that passes over the vocal cords? (p. 425)
  3. 4. Infrasonic waves have a frequency___________ than humans can hear. (p.433)
  4. 6. A violin string has a second harmonic of 880 Hz. The fundamental_____________ of that string is 440 Hz.(p.428)
  5. 7. _____________ sonar technology sends out short pulses of sound and receives them as they are reflected back? (p. 432)
  6. 11. All the possible frequencies of sound waves form a continuous____________ spectrum energy. (p. 422)
  7. 13. A sound's pitch is related to its___________. (p. 422)
  8. 14. Given air, gasoline,_________, and water, which substance will sound travel the fastest? (p. 422)
  9. 16. How high or low a tone sounds is called its_________. (p. 422)
  10. 19. Loudness is most closely related to the______________ of a sound wave. (p. 423)
  11. 21. The sound of a motorcycle (90 dB) passing by is one ____________ times more intense is than an automobile (70 dB) passing by? (p. 423)