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# phy. ch. 25

### vocab and questions

vibration an oscillation, or repeating back-and-forth motion, about an equilibrium position is...
wave a disturbance that repeats regularly in space and time and that is transmitted progressively from one place to the next with no actual transport of matter is...
period the time required to complete a single cycle is...
simple harmonic motion the back-and-forth vibratory motion of a swinging pendulum is...
sine curve a curve whose shape repeats the crests and troughs of a wave is...
trough one of the places in a wave where the wave is the lowest, or the disturbance is the greatest is...
amplitude the distance from the midpoint to the crest of the wave (and vice versa) is...
wavelength the distance from the top of the crest of a wave to the top of the following crest (or trough) is...
frequency the number of events (cycles, vibrations, oscillations) per time
hertz (Hz) the SI unit of frequency, one Hz=w/s
transverse 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 which the wave is traveling
interference pattern a pattern formed by the overlapping of 2 or more waves that arrive in a region at the same time
constructive interference addition of 2 or more waves when crests overlap to produce a resulting wave of increased amplitude
destructive 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 2 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.
in phase term applied to 2 or more waves whose crests and troughs arrive at a place at the same time so that 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 of interference between an incident wave and a reflected wave
node any part of a standing wave that remains stationary.
antinodes the positions on a stationary was where the largest amplitudes occur.
doppler effect the apparent change in frequency of a wave due to the motion of the source of of the receiver
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 (blue) end of the spectrum.
red shift a decrease in the measured frequency of light from a receding source; called red shift because the decrease is toward the low frequency (red) end of the spectrum.
bow wave the V-shaped wave produced by an object moving on a liquid surface faster than the wave speed.
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 eave that sweeps behind a supersonic aircraft reaches the listener.
Created by: 14_ezilchUA

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