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phy. ch. 25
vocab and questions
| Question | Answer |
|---|---|
| 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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