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Lisa Gabel

Chapter 17

TermDefinition
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 a transverse wave.
Trough The lowest point of a transverse wave.
Transverse wave A wave that causes a medium to vibrate at right angle to the direction. In which the wave travels.
Compression An area of a longitudinal wave where the particles of the medium are close together.
Rarefaction An area of longitudinal wave where the particles of the 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 one complete cycle of a periodic motion.
Frequency The number of complete cycles per unit time for a 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.
Amplitude The maximum displacement of a medium from the rest position.
Reflection The interaction that 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 The interaction of two or more waves that combine in a region of overlap.
Constructive interference The interaction among two or more waves in displacement combine to produce a wave with larger displacement.
Destructive interference The interaction among two or more waves in which displacements combine to produce waves with a 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 wave.
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' a field produced by magnets, by changing electric fields, or by moving charges.
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 a given unit of area.
Electromagnetic spectrum The full range of electromagnetic radiation.
Amplitude modulation A method of transmitting a radio signal in which the amplitude of the carrier waves varies while its frequency remains the same.
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- coated picture using variations in infrared radiation to show variations in temperature.
Created by: lisag5678