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Cailynne

Chapter 17&18 Vocab

TermDefinition
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