welcome to "vibration & sound"
vibration: an oscillation, or repeating back and forth motion, about an equilibrium position.
wave: a "wiggle in space and time" a disturbance that repeats regularly in space and time and that is transmitted progressively from one place to the next with no actual transport o matter.
wave period: wave period is time required for one complete is the time required for one complete cycle of vibration to pass a given point. As the frequency of a wave increases, the period of the wave
crest: one of the places in a wave where the wave is highest or the disturbance is greatest.
through: on of the places In a wave where the wave is lowest, or the disturbance is greatest, in the opposite direction from a crests.
amplitude: The distance from the midpoint to the maximum crests of a wave or, equivalently, from the midpoint to the minimum through.
wavelength: The distance from top of the crest of a wave following crest, or equivalently the distance between successive identical parts of the wave.
frequency: The number of event s cycle, vibration, oscillations, or any repeated event per time ;measure in hertz or event per time. Inverse of period.
hertz: The SI unit of frequency. one hertz is one vibration per second.
transvers wave: a wave with vibration at right angles to the direction the wave is traveling.
longitudinal wave: a wave in which the vibration is in the same direction as that In which the wave is traveling. rather than at right angles to it.
Doppler effect: A lens that is thinnest in the middle and that causes parallel rays of light to diverge.
blue shift: An increase in the measured frequency of light from an approaching source; called the blue shift because the apparent increase is toward the high-frequency, or blue, end of the color spectrum.
red shift: A decrease in the measured frequency of light, or other radiation from a receding source; called the red shift because the decrease is toward the low.
shock wave: a cone shaped wave produced by an object moving at supersonic speed through a fluid.
sonic boom: The sharp crack heard when the shock wave that sweeps behind a supersonic aircraft reaces the listener.