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Unit 11
| Term | Definition |
|---|---|
| Amplitude | The maximum displacement from equilibrium (the height of a wave – equilibrium to crest or equilibrium to trough) |
| Antinode | A point in a standing wave, halfway between two nodes, which the greatest amplitude occurs |
| Compression | The region of a longitudinal wave in which the density and pressure are greater than normal |
| Constructive interference | Interference in which individual displacements on the same side of the equilibrium position are added together to form the resultant wave – results in a larger wave |
| Crest | The highest point above the equilibrium position |
| Destructive interference | Interference in which individual displacements on opposite sides of the equilibrium position are added together to form the resultant wave – results in a smaller wave |
| Doppler effect | A frequency shift that is the result of relative motion between the source of sound waves and an observer |
| Electromagnetic wave | Transverse wave consisting of oscillating electric and magnetic fields at right angles to each other |
| Frequency | The number of cycles or vibrations per unit of time |
| Infrasonic wave | Sound waves with a frequency below the average human hearing range |
| Longitudinal wave (compressional) | A wave whose particles vibrate parallel to the direction of wave motion ex: sound |
| Medium | The material through which a wave moves |
| Mechanical wave | A wave that propagates through a deformable, elastic medium (requires a medium |
| Node | A point in a standing wave that always undergoes complete destructive interference and therefore is stationary |
| Period | The time it takes to complete one cycle of motion |
| Periodic wave | A wave whose source is some form of periodic motion |
| Pitch | The perceived highness or lowness of a sound, depending on the frequency of the sound waves |
| Rarefaction | The region of a longitudinal wave in which the density and pressure are less than normal |
| Reflection | The turning back of a wave at the surface of a substance |
| Refraction | The bending of a wave disturbance as it passes another |
| Simple harmonic | Periodic movement around an equilibrium position with a restoring force proportional to the displacement from equilibrium |
| Standing wave | A wave pattern that results when two waves of the same frequency, wavelength and amplitude travel in opposite directions and interfere |
| Transverse wave | A wave whose particles vibrate perpendicular to the direction of wave motion ex: light |
| Trough | The lowest point below the equilibrium position |
| Ultrasonic wave | Sound waves with a frequency above the average human hearing range |
| Wavelength | The distance between two adjacent similar points of the wave, such as from crest to crest or trough to trough (the length/distance of one cycle) |
Created by:
avnitamia
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