Across
- 3. the reduction of density and pressure in a medium-such as air or water-as a longitudinal waver (like sound) travels through it.
- 8. when two or more waves meet at a point in a medium, their disturbances add together linearly.
- 11. the oscillation of a system subjected to a continuous external, periodic driving force.
- 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
- 16. the position of maximum displacement in a standing wave system.
- 17. the apparent change in frequency caused by either the source of the waves moving, the observer moving, or both moving at different velocities.
- 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.
- 21. the frequency or rate that it vibrates naturally when disturbed.
Down
- 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. frequencies that are positive integer multiples (1x, 2x, 3x, etc.) of a fundamental frequency (f1) produced by a vibrating system.
- 4. the superposition of in-phase waves that produce a resultant wave with larger amplitude.
- 5. the subjective perception of sound frequency, determining how high or low a tone sounds to the human ear.
- 6. a wave pattern formed by the interference of two waves with the same frequency and amplitude traveling in opposite directions.
- 7. the reduction in volume or size of a material, fluid, or gas resulting from applied, inward-balanced forces pressure.
- 9. longitudinal sound waves with frequencies below 20 Hz, falling below the lower limit of human hearing.
- 10. the phenomenon where two or more waves superimpose (overlap) to form a resultant wave of greater, lower or zero amplitude.
- 12. a pulsating sound produced when two sound waves with different frequencies interact.
- 13. the phenomenon where a system oscillates with significantly higher amplitude when driven by an external periodic force at it's natural frequency.
- 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.
- 19. sound waves with frequencies higher than the upper limit of human hearing, generally exceeding 20 KHz (20,000 Hz).
- 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).