# Waves & Sound Glossary Terms Chapter 8

 Vibration -the cyclical motion of an object about an equilibrium point Mechanical Wave -the transfer of energy through a material due to vibration Medium -the material that permits the transmission of energy through vibrations Translational Molecular Motion -the straight-line motion of a molecule; this motion is typical of gasses because the particles in liquids and solids are not free to move in this manner Transverse Wave -a wave in which particles vibrate perpendicular to the direction of the flow of energy Compression -the region in a longitudinal wave in which the medium's particles are closer together Rarefraction -the region in a longitudinal wave in which the medium's particles are farther apart Sound -a form of energy produced by rapidly vibrating objects detectable by sensory organs such as the ear Amplitude -the maximum displacement of a wave from its equilibrium point Waveform -the shape of a wave when graphed Crest -the maximum point of a transverse wave Trough -the minimum point of a transverse wave Wavelength (λ) -the distance between two similar points in successive identical cycles in a wave, such as from crest to crest or trough to trough Phase -in a continuous transverse or longitudinal wave, the x-coordinate of a unique point of the wave Phase Shift -a shift of an entire wave along the x-axis with respect to an otherwise identical wave In Phase -the state of two identical waves that have the same phase shift Out Of Phase -the state of two identical waves that have different phase shifts Frequency (f) -the number of complete cycles that occur in unit time, usually 1 s; measured in hertz (Hz) Period (T) -the time for a vibrating particle to complete one cycle Wave Speed (v) -the rate at which a wave is travelling through a medium; also a measure of how fast the energy in the wave is moving Simple Harmonic Motion -any motion that repeats itself at regular intervals Universal Wave Equation v=fλ Audible Sound Wave -sound wave in the range of human hearing, 20 Hz to 20kHz Infrasonic Wave -sound wave with a frequency below 20 Hz Ultrasonic Wave -sound wave with a frequency above 20kHz Echo -the sound energy reflected off a surface back to the producer of the sound Speed Of Sound Equation v=331.4m/s + (0.606m/s/°C)T Mach Number (M) -the ratio of the airspeed of an object to the local speed of sound Pressure (p) -the force per unit area Sound Intensity -the amount of sound energy being transferred per unit area; unit W/m2 Decibel (dB) -the unit of sound level used to describe sound intensity level Loudness And Sound AuthorMalloryHaggith ID315326 Card SetWaves & Sound Glossary Terms Chapter 8 DescriptionWaves & Sound Glossary Terms Chapter 8 Updated2016-02-07T23:36:29Z Show Answers