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Jacob Hopkins
Chapter 17
| Term | Definition |
|---|---|
| mechanical wave | disturbance in matter that carries energy from one place to another |
| medium | the material through which a wave travels |
| crest | the highest position of a wave above the rest position |
| trough | the lowest point below the rest position |
| transverse wave | a wave that causes the medium to vibrate at right angles to the direction in which the waves travel |
| compression | area where the particles in a medium are spaced close together |
| rarefaction | any area where particles in a medium spread out |
| longitudinal wave | is a wave in which the vibration of the medium is parallel to the direction to the direction the wave travels |
| surface wave | a wave that separating two media` |
| periodic motion | any motion that repeats at a regular time in intervals |
| frequency | number of complete cycles in a given time |
| hertz | frequency measured in cycles per second |
| wavelength | the distance between a point on a wave and its same position in the cycle |
| amplitude | maximum displacement of the medium |
| reflection | when a wave bounces of a surface |
| refraction | is the bending of a wave as it enters a new medium at an angle |
| diffraction | the bending of a wave as it moves around another |
| interference | occurs when 2 or more waves combine |
| constructive interference | occurs when two or more waves combine to produce a wave with a larger displacement |
| destructive interference | when two or more waves combine to make a smaller displacement |
| standing wave | a wave that appears to stay in one place |
| node | a point on a standing wave that has no displcaement |
| antinode | a point where a crest or trough occurs midway between nodes |
| electromagnetic waves | transverse waves consisting of changing electric fields |
| electric field | a region of space exerts electric force on changed particles |
| magnetic fields | a region of space produces magnetic forces |
| electromagnetic radiation | transfer of energy by electromagnetic waves |
| photons | packets of electromagnetic energy |
| intesity | the rate at which a waves energy travels through a given amount of area |
| photoelectric effect | light striking metal |
| electromagnetic spectrum | a full range of frequencies of electromagnetic radiation |
| amplitude modulation | the amplitude of a wave is varied |
| frequency modulation | frequency of a wave is varied |
| thermograms | colorcoded pictures |
Created by:
Jacob Hopkins
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