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Mary Russell

Chapter 17 & 18 vocab

mechanical wave is a disturbance in matter that carries energy from one place to another
medium the material through which a wave travels
crest the highest point of a wave above the rest position.
trough the lowest point 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 spaced close together.
rarefaction an area where the particles in the medium are spread out.
longitudinal wave is a wave in which the vibration of the medium is parallel to the direction in which the waves travels.
surface wave a wave that travels a long surface separating to 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 is measured in in cycles per second
wave length is the distance between a point on one wave and the same point on the next cycle of the wave.
amplitude the maximum displacement of the medium from its rest position.
reflection occurs when a wave bounces off a surface that it can not pass through.
refraction is the bending of the wave as it enters a new medium at an angle.
diffration is 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 a larger displacement.
destructive interference occurs when two or more waves combine to produce a wave with a smaller displacement.
standing wave is a wavr that appears to stay in one place and it does not seem to move through the medium.
node a point on standing wave that has no displacement from the rest position.
antinode is a point where a crest or trough occurs midway between two nodes.
electromagnetic waves are transverse wave consisting of changing electric fields and changing magnetic fields.
electric field in a region of space exerts electric forces on charged particles.
magnetic field is a region of space produces magnetic forces.
electromagnetic radiation behaves sometimes like a wave and sometimes like a stream of particles.
photoelectric effect emission of electrons from a metal caused by light striking the metal.
photons packets of electromagnetic energy
intensity light decreases as photons travel farther from the source.
electromagnetic spectrum full range of frequencies of electromagnetic radiation.
amplitude modulation the amplitude of the wave is varied.
frequency modulation the frequency of a wave is varied.
thermograms are color coded pictures that show variations in temperature.
Created by: mrussell03