Sound Vocabulary

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Across
  1. 3. the reduction of density and pressure in a medium-such as air or water-as a longitudinal waver (like sound) travels through it.
  2. 8. when two or more waves meet at a point in a medium, their disturbances add together linearly.
  3. 11. the oscillation of a system subjected to a continuous external, periodic driving force.
  4. 14. the superposition of two waves that are out of phase with each other in such a way as to produce a smaller wave or cancelling each other out entirely.g
  5. 16. the position of maximum displacement in a standing wave system.
  6. 17. the apparent change in frequency caused by either the source of the waves moving, the observer moving, or both moving at different velocities.
  7. 18. a logarithmic unit used in physics to express the ratio of two sound intensities or powers, or to measure sound pressure relative to a reference value.
  8. 21. the frequency or rate that it vibrates naturally when disturbed.
Down
  1. 1. velocity exceeding Mach 5- five times the speed of sound-typically starting around 3,836 mph (6,174 km/b or 1.72 km/s).
  2. 2. frequencies that are positive integer multiples (1x, 2x, 3x, etc.) of a fundamental frequency (f1) produced by a vibrating system.
  3. 4. the superposition of in-phase waves that produce a resultant wave with larger amplitude.
  4. 5. the subjective perception of sound frequency, determining how high or low a tone sounds to the human ear.
  5. 6. a wave pattern formed by the interference of two waves with the same frequency and amplitude traveling in opposite directions.
  6. 7. the reduction in volume or size of a material, fluid, or gas resulting from applied, inward-balanced forces pressure.
  7. 9. longitudinal sound waves with frequencies below 20 Hz, falling below the lower limit of human hearing.
  8. 10. the phenomenon where two or more waves superimpose (overlap) to form a resultant wave of greater, lower or zero amplitude.
  9. 12. a pulsating sound produced when two sound waves with different frequencies interact.
  10. 13. the phenomenon where a system oscillates with significantly higher amplitude when driven by an external periodic force at it's natural frequency.
  11. 15. a point, line, or region along a standing wave where the medium remains permanently at rest, experiencing zero displacement or vibrations due to destructive interference.
  12. 19. sound waves with frequencies higher than the upper limit of human hearing, generally exceeding 20 KHz (20,000 Hz).
  13. 20. a dimensionless quantity in physics and aerodynamics defined as the ration of an objectict's speed (v) to the local speed of sound (a) in the surrounding medium (usually air).