Across
- 3. the reduction of density and pressure in a medium—such as air or water—as a longitudinal wave (like sound) travels through it
- 8. the principle that when two or more waves traverse the same space simultaneously, the resulting displacement (amplitude) at any point is the algebraic sum of the individual waves' displacements.
- 11. the oscillation of a system under the influence of an external periodic force
- 14. a phenomenon in physics where two or more waves overlap, with the crest of one wave aligning with the trough of another, resulting in a new wave with a smaller, or zero, amplitude.
- 16. a point on a standing wave where constructive interference causes maximum amplitude and oscillation, with the medium moving between high and low displacement
- 17. the change in frequency or pitch of a wave (sound or light) perceived by an observer when the wave source and the observer are moving relative to each other
- 18. a logarithmic unit used in physics to measure the intensity of sound, power, or signal strength relative to a reference level
- 21. the inherent rate at which an object or system tends to oscillate, vibrate, or resonate when disturbed, without any driving or damping force acting upon it
Down
- 1. atmospheric flight moving at Mach 5 or higher—five times the speed of sound
- 2. a sinusoidal wave (or oscillation) with a frequency that is a positive integer multiple of a fundamental, lowest-resonant frequency.
- 4. a phenomenon in physics where two or more waves of the same frequency and phase superimpose, aligning their crests and troughs to create a new wave with a larger amplitude
- 5. the subjective perception of sound frequency, determining how high or low a tone sounds to a listener
- 6. a wave pattern formed by the interference of two traveling waves with the same frequency and amplitude moving in opposite directions
- 7. the reduction in volume or size of a material caused by applying inward-pushing forces (stress), which brings particles or molecules closer together
- 9. low-frequency sound, typically between 0.01 Hz and 20 Hz, which is below the threshold of human hearing
- 10. the phenomenon where two or more waves superpose (overlap) to form a resultant wave of greater, lower, or the same amplitude
- 12. the periodic, rhythmic fluctuations in loudness (intensity) heard when two sound waves of slightly different frequencies interfere with each other
- 13. the phenomenon where a system oscillates with significantly higher amplitude when driven by an external periodic force at its natural frequency
- 15. a point along a standing wave where the wave has minimum or zero amplitude, meaning the medium remains motionless
- 19. sound waves with frequencies higher than the upper audible limit of human hearing
- 20. a dimensionless quantity and fluid dynamics representing the ratio of an object's speed (to the local speed of sound in the surrounding medium