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  1. audio spectrum
  2. decibel
  3. equilibrium
  4. intensity
  5. cavitation
  6. threshold of hearing
  7. infrasonic waves
  8. relative intensity
  9. nonlinear receiver
  10. elastic medium
  11. ultrasonic waves
  12. sonic waves
  13. pitch
  14. displacement wave train
  15. Doppler effect
  16. sound
  17. Savart's wheel
  18. Mach numbers
  19. loudness
  20. mean free path
  21. amplitude
  22. hardness, density, and temperature
  23. supersonic speed
  24. one decibel
  25. True
  26. shock wave
  27. order of magnitude
  28. positive, negative
  29. ultrasonic tomography
  30. note
  31. octave
  32. sonic boom
  1. a term for the intensity detectable by a person with normal hearing
  2. b Loudness is a measure of ____ ____; specifically, a relationship of one sound to a barely audible sound.
  3. c Scientific studies have shown that perceived loudness is determined, not by absolute intensity, but by the ___ __ _____ of absolute intensity.
  4. d True or False: Sound is a periodic wave train.
  5. e term for a toothed disk that demonstrates pitch as it spins on its axis
  6. f term for a sound of definite pitch produced by a singing voice or a musical instrument
  7. g term for a speed past that of sound; breaking the sound barrier
  8. h term for the average distance of travel between collisions
  9. i Although gas particles are not held together by elastic force, they form a(n) ____ ____ that resists any departure from uniform pressure.
  10. j the just noticeable difference, or the smallest difference a human ear can detect
  11. k term for the range of frequencies or wavelengths that can be heard
  12. l term for the undulating variation in displacement of molecules along the path of a sound wave
  13. m term for a violent disturbance traveling outward, that occurs when an object breaks the sound barrier
  14. n term for any shift in the wavelength and frequency of waves due to motion of the source (or to motion of the observer)
  15. o term for maximum displacement of a wave
  16. p term for the movement of longitudinal waves through an elastic medium, whether solid, liquid, or gas
  17. q term for two notes with one twice the frequency of the other; heard as the same note at different levels
  18. r term for the human perception of intensity
  19. s term for sonic waves with frequencies above 20,000 Hz, the upper limit of the audio range
  20. t oen common measure of loudness
  21. u term for our perception of audible frequency
  22. v When passed through a liquid, ultrasound at high intensity causes _____, the formation of cavities.
  23. w term for a molecule's original position
  24. x three factors that affect the speed of sound
  25. y another term for sound waves
  26. z numbers used to related the speed of jets to the speed of sound
  27. aa For the Doppler equation, any motion of one toward the other is ____, and any motion of one away from the other is _____.
  28. ab term for the sound heard when a shock wave sweeps over listeners at ground level
  29. ac The ear is a(n) _____ ____ of sound intensity; that is, the perceived loudness of a sound is not a simple linear function of intensity measured in W / meters squared
  30. ad term for a versatile procedure that can find tumors and gallstones or show a developing child within the womb
  31. ae term for sonic waves below 20 Hz, the lower limit of audible sound
  32. af term for the amount of energy flowing per unit time through a unit area at right angles to wave motion; quantity that represents the strength of sound