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# Chapter 25Vocabulary

### Unruh's Chapter 25 Vocabulary

an oscillation, or repeating back-and-forth motion, about an equilibrium position vibration
a distance that repeats regurlarly in a space and time and that is transmitted progressively from one place to the next with no actual transport of matter. wave
The time required for a pendulum to make one to-and-fro swing. In general, the time required to complete a single cycle. period
the back-and-forth vibratory motion of a swinging pendulum 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 conveyor belt sine curve
one of the places in a wave where the wave is highest or the disturbance is greatest crest
one of the places in a wave where the wave is lowest, or the disturbance is greatest, in the opposite direction from a crest trough
the distance from the midpoint to the maximum (crest) of a wave or, equivalently, from the midpoint to the minimum (trough) amplitutde
the distance from 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
the number of events (cycles, vibrations, oscillations, or any repeated event) per time; measured in hertz (or events per time). Inverse of period. frequency
the SI unit of frequency. One hertz (Hz) is one cycle per second. hertz
a wave with vibration at right angles to the direction the wave is traveling. transverse wave
a wave in which the vibration is the same direction as that in which the wave is traveling, rather than at right angles to it. longitudinal wave
a pattern formed by the overlapping of two or more waves that arrive in a region at the same time. interfernece pattern
addition of two of more waves when wave crests overlap to produce a resulting wave of increased amplitude constructive interference
combination of waves where crests of one wave overlap troughs of another, resulting in a wave of decreased amplitude. destructive intereference
term applied to two waves for which the crest of one wave arrives at a point at the same time that a trough of the second wave arrives. Their effects cancel each other. out of phase
term applied to two or more waves whose crests (and troughs) arrive at a place at the same time, so that their effects reinforce each other. in phase
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
any part of a standing wave that remains stationary node
the positions on a standing wave where the largest amplitudes occur antinodes
the apparent change in frequency of a wave due to the motion of the source or of the receiver. doppler effect
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. Also occurs when an observer approaches a source. blue 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 frequency, or red, end of the color spectrum. red shift
the v-shaped wave produced by an object moving on a liquid surface faster than the wave speed. bow wave
a cone-shaped wave produced by an object moving at supersonic speed through a fluid. shock wave
the sharp crack heard when the shock wave that sweeps behind a supersonic aircraft reaches the listener. sonic boom
Created by: unruh

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