Waves & Sound Glossary Terms Chapter 10

  1. Human Ear Structure
  2. Human Ear Function (How You Hear)
    • -compressions push in the eardrum because of increased atmospheric pressure
    • -rarefractions have the reverse effect by reducing pressure in the outer ear
    • -the eardrum now pushes out because of the higher air pressure in the middle earĀ 
    • -the eardrum then starts to vibrate in response to the sound wave
  3. Hearing Loss
    -hearing aids can improve hearing loss in some cases
  4. Music
    -sound that originates from a combination of musical notes that originate from a source that vibrates in a uniform manner with one or more constant frequencies
  5. Noise
    -sound that originates from a source that vibrates in a random manner
  6. Pitch
    -the general perception of the highness or lowness of a sound; depends on the frequency, complexity, and loudness of the sound
  7. Quality
    -the pleasantness of a sound; related to the waveform of the sound
  8. Resonator
    -an object, usually a hollow chamber called a case box or a sounding board, that vibrates in resonance with the source of sound
  9. Frequency And Length Of The String
  10. Building Acoustics
    -the total effect of sound produced in an enclosed or restricted space
  11. Mechanical Resonance
    -the transfer of energy from one object to another, causing large-amplitude vibrations when the second object has the same resonant frequency as the first
  12. Sympathetic Vibration
    -the response to a vibration with the same resonant frequency
  13. Aeroelastic Flutter
    -the response when the energy added to a structure vibrating in air exceeds the energy lost due to damping, causing large vibrations
  14. Vibrations In Buildings
    -large vibrations in buildings can be caused by earthquakes, however, for most areas they are caused by wind
  15. Tsunami
    -an enormous sea wave or a series of enormous sea waves caused by an earthquake or other disturbance
  16. Seismic Waves
    -waves of energy that travel through Earth
  17. Causes Of Vibrations In Aircrafts
    • -vibrations occur during extension and retraction of landing gear, deployment of aerodynamic brakes, and takeoff and landing
    • -the operation of the engines also produces constant vibration
    • -other normal vibrations come from the mass distribution and the structural stiffness of the aircraft
    • -abnormal causes of vibration include malfunctions in mechanical equipment, an engine rotor imbalance, irregular airflow over an external part of the aircraft that is damaged or not closed properly, excessive wear, and free play
  18. Echolocation
    -the location of objects through the analysis of echoes, or reflected sound
  19. Echolocation In Dolphins, Bats, Elephants, House Cats
    • -dolphins, sperm whales, and orca whales use echolocation to navigate and detect prey in dark, murky waters
    • -bats also use echolocation to detect prey
    • -elephants produce infrasound waves, which travel partially through the ground and can detect these sounds with their feet and trunks pressed against the ground
    • -cats use their large movable pinnae to amplify sound and to detect the direction from which sounds are coming
Card Set
Waves & Sound Glossary Terms Chapter 10
Waves & Sound Glossary Terms Chapter 10