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Ch. 17 Vocab

Vocabulary terms for chapter 17

Mechanical Wave 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 the 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 a medium are spread out
Longitudinal Wave A wave in which the vibration of the medium is parallel to the direction the wave travels
Surface Wave A wave that travels along a surface separating two media
Periodic Motion Any motion that repeats at regular time intervals
Period The time required for a complete motion that returns to the starting point
Frequency The number of complete cycles in a given time
Hertz Frequency is measured in cycles per second, or Hertz
Wavelength 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 What 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 A wave that appears to stay in one place and does not seem to move through the medium
Node A point on a 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 magnetic fields
electric field a region of space exerts electric forces on charged particles
magnetic field a region of space that produces magnetic forces
electromagnetic radiation the transfer of energy by electromagnetic waves passing through matter or 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 wave's energy flows through a given unit of area
electromagnetic spectrum the full range of frequencies of electromagnetic radiation
amplitude modulation the amplitude of a wave is varied
frequency modulation the frequency of a wave is varied
thermograms color-coded pictures that show variations in temperature
Created by: paul.hornacek