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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 |