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# ch. 25 vocab

### helen's ch. 25 vocab

vibration an oscillation, or repeating back and forth motion , about an equilibrium position
wave repeats in space and time and is transmitted progressivley from one place to the next with no transport if matter
period the time required for a pendulm to make one to and fro swing and the time required for a complete orbit
simple harmonic motion the back and forth vibratory motion of a swinging pendulum
sine curve a curve whose shape represents the crests and troughs of the wave, traced out by a swinging pendulum
crest one of the places in a wave where the wave is highest of disturbance is greatest
trough one of the places in a wave where the wave is lowest or the disturbance is greatest oppisite of crest
amplitude the distance from the midpoint to the maximum (crest) of a wave or, equivalenty , from the midpoint to the miinimum (trough)
wavelenght the distance from the top of the crest of a wave to the top of the following crest
frequency the number of events per time measured in hertz
hertz the SI unit of frequency . one hertz is one cycle per second
transverse wave a wave with a 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 which the wave is traveling
interference pattern a pattern formed by the overlaping of two or more waves that arrive in a region at the same time
constructive interference additon of two or more waves when wave crests overlap to produce a resulting wave of increased amplitude.
destrcutive interference combination of waves where crests of one wave overlap troughs of another, resulting in a wave of decreased amplitude
out of phase term applied to two waves for which the crest of one wave arrives at a point at the same time a trough of the second wave arrives
in phase two or more waves whose crests or troughs arrive at a place at the same time, their effects reinforce each other
standing wave wave in which parts of the wave remain stationary and the wave appears not to be traveling . the result is a reflected wave
node any part of a standing wave that remains stationary
antinodes the positions on a standing wave where the largest amplitudes occur
doppler effect the appearent change in frequency of a wave due to the motion of the source of the receiver
blue shift increase in the measured frequency of light from an approching source called blue shift because the increase is toward the blue end of the color spectrum
red shift decrease in the measured frequency of light from a receding source called a red shift because decrease is toward the low frequency
bow wave v shaped wave produced by an object monerving at supersonic speed through a fluid.
sonic boom the sharp crack herd when the shock wave that sweeps behind a supersonic aircraft reaches the listner.
Created by: hkramer

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