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Hristina Bundalo

Chapter 17+18

TermDefinition
mechanical wave disturbance in matter that carries energy from one place to another
medium material in which a wave travels through
crest highest point of the wave above the rest position
trough lowest point of the wave below rest position
transverse wave wave that causes the medium to vibrate at right angles to the direction in which the wave travels
compression area where particles in the medium are spaced close together
rarefaction area where particles in the medium are spread far apart
longitudinal wave wave in which the vibration of the medium is parallel to the direction the wave travels
surface wave wave that travels along the surface separating two media
periodic motion any motion that repeats at regular times intervals
period the time required for one cycle, a complete motion that returns to its starting point
frequency number of complete cycles in a given time
hertz cycles per second
wavelength distance between a point on one wave and the same point on the next cycle of the wave
amplitude of a wave is the maximum displacement of the medium from its rest position
reflection occurs when a wave bounces off a surface that 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 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 smaller displacements
standing wave wave that appears to stay in one place, it doesn't seem to move through the medium
node a point on the standing wave that has no displacement from the rest position
antinode a point where a crest or trough occurs midway between two nodes
electromagnetic waves transverse waves consisting of changing electric fields and changing magnetic fields
electric field in a region of space exerts electric forces on charged particles
magnetic field a region in space produces magnetic forces
electromagnetic radiation the transfer of energy by electromagnetic waves traveling through matter or across space
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 the full range of frequencies of electromagnetic radiation
amplitude modulation the amplitude of the wave is varied, the frequency remains the same
frequency modulation the frequency of the wave is varied, the amplitude remains the same
thermograms color-coded pictures that show variations in temperature
Created by: hristina.bundalo