sound waves

2. a point along a standing wave where the medium remains permanently at rest, experiencing zero amplitude or displacement
3. speeds equal to or greater than Mach 5—five times the speed of sound—typically exceeding 3,800 mph (6,100 km/h)
8. the oscillation of an object or system subjected to a continuous external periodic force, causing it to vibrate at the driving frequency rather than its own natural frequency
10. when two or more waves overlap, the resulting displacement at any point is the algebraic sum of the individual wave displacements
11. the change in the frequency or wavelength of a wave (sound or light) in relation to an observer who is moving relative to the wave source
15. a unit of measurement in stating the speed of a moving object in relation to the speed of sound
17. a phenomenon in physics where two or more waves of the same frequency and phase superimpose to reinforce each other, resulting in a single wave with greater amplitudeDestructivesInterference
18. a wave pattern formed by the interference of two traveling waves with the same frequency and amplitude moving in opposite directions
19. segment of a longitudinal wave (such as sound) where the medium's density and pressure are reduced, creating a region where particles are spread apart
20. waves with frequencies higher than the human hearing limit, typically above

1. waves with frequencies below 20 Hz
4. the reduction in volume or the shortening of an object caused by external inward-pushing forces (stress)
5. the position of maximum displacement in a standing wave system
6. a sinusoidal wave with a frequency that is a positive integer multiple of the fundamental frequency of a periodic signal
7. the periodic, rhythmic fluctuations in loudness (intensity) produced by the interference of two sound waves with slightly different frequencies
9. a logarithmic unit used in physics and engineering to express the ratio between two values of a physical quantity, typically power or intensity
12. the subjective auditory sensation that allows a listener to classify sound as "high" or "low"
13. a physics phenomenon where a system oscillates with significantly higher amplitude at specific frequencies
14. the phenomenon where two or more waves superpose (overlap) to form a resultant wave of greater, lower, or the same amplitude
16. the inherent rate at which an object or system tends to oscillate, vibrate, or swing when disturbed, without any external driving or damping forces