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ch. 25 vocab
helen's ch. 25 vocab
| Question | Answer |
|---|---|
| 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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