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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 of a transverse wave
Trough The lowest point of a transverse wave
Transverse Wave A wave that causes a medium to vibrate at right angles to the direction the wave is traveling
Compression An area of a longitudinal wave where the particles of the medium are close together
Rarefaction An area of a 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 the surface separating two media; a transverse wave that develops when a seismic wave reaches Earth's surface
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
Wave Length 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
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
Magnetic Field A field in a region of space that exerts on a magnet, on a ferromagnetic material, or on a moving electric 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 A rate at which the wave's energy flows through a given unit of area
Electromagnetic Spectrum A full range of electromagnetic radiation
Amplitude Modulation A method of transmitting a radio signal in which the amplitude of the carrier wave 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-coded picture using variations in infrared radiation to show variations in temperature
Created by: nichols143