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Noah Vega

Ch. 17 & 18

TermDefinition
periodic motion any motion that repeats at regular time intervals.
period the time required for one complete cycle of periodic motion.
frequency the number of complete cycles per unit time of periodic motion.
hertz the unit of measure for frequency, equal to one cycle per second.
wavelength the distance between a point on a wave and the same point on the next cycle of the wave.
reflection the interaction that occurs when a wave bounces off a surface it cannot pass through.
refraction the bending of a wave as it enters a new medium at an angle.
diffraction 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.
constructive interference the interaction among two or more waves in which displacements combine to produce a wave with a larger displacement.
destructive interference the interaction among two or more waves in which displacements combine to produce a wave with smaller displacement.
standing wave a wave that appears to stay in one place and does not seem to move through a medium.
node a point on a standing wave that has no displacement from the rest position.
antinode a point of maximum displacement midway between two nodes in a standing way.
electromagnetic waves a transverse wave consisting of changing electric and changing magnetic fields.
electric field a field in a region of space that exerts electric forces on charged particles; a field produced by electric charges or by changing magnetic fields.
magnetic field a field in a region of space that exerts magnetic forces.
electromagnetic radiation the transfer of energy by electromagnetic waves.
photoelectric effect the emission of electrons from a metal caused by light striking the metal.
photons a packet of electromagnetic energy.
intensity the rate at which a wave's energy flows through given unit of area.
electromagnetic spectrum a full range of electromagnetic radiation.
amplitude the maximum displacement of a medium from the rest position.
modulation ggggggg
frequency modulation a method of transmitting a radio signal in which the frequency of the carrier wave varies while its amplitude remains the same.
thermograms a color coded picture using variation in infrared radiation to show changes in temperature.
mechanical wave a disturbance in matter that carries energy from one place to another
medium the material through which a wave travels
crest
trough
transverse wave
compression
rarefaction
longitudinal wave
surface wave
Created by: noahavega