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# Waves and Sound

### Waves and Sound Vocabulary

Compression The region of a longitudinal wave in which the density and pressure are greater than normal.
Pitch The perceived highness or lowness of a sound, depending on the frequency of the sound wave.
Amplitude The maximum displacement from equilibrium.
Longitudinal Wave A wave whose particles vibrate parallel to the direction of wave motion.
Crest The highest point above the equilibrium position.
Wavelength The distance between two adjacent similar points of the wave.
Standing Wave A wave pattern that results when two waves of the same frequency, wavelength, and amplitude travel in opposite directions and interfere.
Antinode A point in a standing wave, halfway between two nodes, at which the largest amplitude occurs.
Beat The interference of waves of slightly different frequencies traveling in the same direction.
Doppler Effect A frequency shift that is the result of relative motion between the source of sound waves and an observer.
Resonance A condition that exists when the frequency of a force applied to a system matches the natural frequency of vibration of the system.
Frequency The number of cycles or vibrations per unit of time.
Pulse Wave A single disturbance in a medium
Node A point in a standing wave that always undergoes complete destructive interference and therefore is stationary.
Rarefaction The region of a longitudinal wave in which the density and pressure are less than normal.
Simple Harmonic Motion Vibration about an equilibrium position in which a restoring force is proportional to the displacement from equilibrium.
Trough The lowest point below the equilibrium position.
Diffraction The spreading of waves into a region behind an obstruction.
Transverse Wave A wave whose particles vibrate perpendicular to the direction of the wave motion.
Decibel Level Relative intensity determined by relating the intensity of a sound wave to the intensity at the threshold of hearing.
Periodic Wave A wave whose source is some form of periodic motion.
Loudness The magnitude of the physiological sensation produced by a sound, which varies directly with the physical intensity of sound.
Propagate To cause a wave to move in some direction or through a medium.
Medium The material through which a disturbance travels.
Period The time it takes to execute a complete cycle of motion.
Timbre The quality or "color" of the sound. The reason the same note played on a flute and a piano sound different.
Created by: stamback

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