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### 25 Cards in this Set

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 the distance from the midpoint to the crest of a wave or equivalently from midpoint to the trough. amplitude the positions on a standing wave where the largest amplitudes occur. antinodes an increase in the measured frequency of light form an approaching source. blue shift the v-shaped wave produced by an object moving on a liquid surface faster than the wave speed. bow wave addition of two or more waves when wave crests overlap to produce a resulting wave of increased amplitude. constructive interference the change in frequency of a wave due to the motion of the source or of the receiver. doppler effect # of events per time; measured in Hertz. (inverse of period) frequency # the SI unit of frequency, one hertz = 1 vibration per second. hertz 2 or more waves whose crests (and troughs) arrive at a place at the same time, so that their effects reinforce each other. in-phase formed by the overlapping of two or more waves that arrive in a region at the same time. interference pattern 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. longitudinal wave any part of a standing wave that remains stationary. node two waves for which the crest of one wave arrives at a point at the same time that a trough of the 2nd wave arrives. their effects cancel each other. out of phase time required for a pendulum to make 1 to-and-from swing. time to make a complete cycle. period decrease in the measured frequency of light (or other radiation) from a receding source. red shift a cone-shaped wave produced by an object moving at supersonic speed through a fluid shock wave periodic motion in which acceleration is proportional to the distance from an equilibrium positiion and is direted toward that requilibrium position. simple harmonic motion a curve whose shape represents the crests and troughs of a wave, as traced out by a swinging pendulum that drops a trail of sand over a moving conveyer belt. sine curve the sharp crack heard when the shock wave that sweeps behind a supersonic aircraft reaches that listener. sonic boom wave in which parts of the wave remain stationary and the wave appears not to be traveling. the result of interference between an incident (original) wave and a reflected wave. standing wave a wave with vibration at right angles to the direction the wave is traveling. transverse wave one of the places in a wave where the wave is lowest, or the dirsturbance is greatest, in the opposite direction from a crest. trough an oscillation, or repeating back and forth motion, about an equilibrium position. vibration a "wiggle in space and time;" a disturbance that rpeats regularly in space and time and that is transmitted progressively from one place to the next with no actual transport of matter. wave the distance form the top of the crest of a wave to the top of the following crest; or equivalently the distance between successive identical parts of the wave. wavelength