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Cailynne
Chapter 17&18 Vocab
| Term | Definition |
|---|---|
| mechanical wave | it is a disturbance in matter that carries energy from one place to another |
| medium | the material in which a wave travels through |
| crest | the highest point of a wave below the rest position |
| transverse wave | a wave that causes the medium to vibrate at right angles to the direction in which the wave travels |
| compression | an area where the particles in a medium are close together |
| rarefraction | area where the particles in a medium are spread apart |
| longitude waves | is a wave in which the vibration of the medium is parallel to the direction the wave travels |
| surface wave | the wave that travels along a surface separating two media |
| periodic motion | any motion that repeats at regular time intervals |
| period | the time required for one cycle, a complete motion that returns to its starting point |
| frequency | the number of complete cycles in a given time |
| hertz | frequency measured in cycles per second |
| wavelength | the distance between a point on one wave and the same point of the next cycle of the wave |
| amplitude | the max displacement of the medium from its rest position |
| reflection | occurs when a wave bounces ff a surface that it can't pass through |
| refraction | the bending of a wave as it enters a new medium at an angle |
| diffravtion | its the bending of a wave as it moves around an obstacle or passes through a narrow opening |
| interference | the interaction of two or more waves that combine in a region of overlap |
| constuctive interference | the interaction among two or more waves in which displacements combine to produce a wave with a larger displacement |
| destuctive interference | the interaction among two or more waves in ehich displacements combine to produce a wave with smaller displacements |
| standing wave | wave that appears to stay in one place and doesn't seem to move through the medium |
| node | point on a standing wave that has no displacement from the rest position |
| antinode | point of max displacement midway between two nodes in a standing wave |
| electromagnetic waves | transverse wave consisting of changing electric and changing magnetic feilds |
| electric feild | field in a region of space that exerts electric forces on charged particles; a field produced by electric charges or by changing magnetic feilds |
| magnetic feild | field in region of space that exerts magnetic forces; field produced by magnets, by changing electric fields, or moving charges |
| electromagnetic radiation | transfer of energy by electromagnetic waves |
| photoelectric effect | the emission of electrons from a metal caused by light striking the metal |
| photons | packet of electromagnetic energy |
| intensity | the rate at which a waves energy flows through a given unit of area |
| electromagnetic spectrum | full range of electromagnetic radiation |
| amplitude modulation | method of transmitting a radio signal in which the amplitude of the carriee wave varies while its frequency remains the same |
| frequency modulation | method of tranmitting a radio signal in which the frequency of the carrier varies while its amplitude remains the same |
| thermograms | color coded picture using variations in infrared radiation to show varations in temp |
Created by:
cailynne.riegler
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