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Chp17+18Vocab_Ernst

TermDefinition
mechanical wave disturbance in matter that carries energy from one place to another
medium material through which waves travel
crest highest point of the wave
trough lowest point of the wave
transverse wave a wave that causes the medium to vibrate at right angles to the direction in which the wave travels
compression area where particles in a medium are spaced close together
rarefaction area where particles in a medium are spread out
longitudinal wave a wave in which the vibration of the medium is parallel to the direction the waves travel
surface wave a wave that travels along a surface separating two media
periodic motion motion that repeats at regular time intervals
period 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 unit of frequency
wavelength the distance between a point on one wave and the same point on the next cycle of waves
amplitude the maximum displacement of the medium from it's rest position
reflection occurs when a wave bounces off a surface that it cant 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 occurs when two or more waves overlap and combine together
constructive interference occurs when two or more waves combine to produce a wave with larger displacement
destructive interference occurs when two or more wave combine to produce a wave with smaller displacements
standing wave a wave that appears to stay in one place
node a point on a standing wave that has no displacement from the rest point
antinode a point where the crest or trough occurs midway between two nodes
electromagnetic waves transverse waves consisting of changing electric fields and changing magnetic fields
electric field a region of space exerts electric forces on charged particles
magnetic field a region of space produces magnetic forces
electromagnetic radiation transfer of energy by electromagnetic waves traveling through matter
photoelectric effect the emission of electrons from a metal caused by light striking the metal
photons packets of electromagnetic energy
intensity the rate at which a waves energy flows through a given unit of area
electromagnetic spectrum a full range of frequencies of electromagnetic radiation
amplitude modulation the amplitude of the wave is varied
frequency modulation the frequency of the wave is varied
thermograms color coded pictures that show variations in temperature
Created by: david.ernst