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Ch 17&18 vocab

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 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 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 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 A unit of measurement for frequency, equal to one cycle per unit.
Wavelength The distance between a point of a wave and the same point on the next cycle on 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.
Refration 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 Interfernce The interaction among two or more waves in which displacements combine to produce a wave with a larger displacement.
Destructive Interference The interaction among two or more waves in which displacement combine to produce a wave with a smaller displacement.
Standing Wave A wave that appears to stay in on 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 changing 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 magnetic forces.
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 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 the amplitude remains the same.
Thermograms A color-coded picture using variations in infrared radiation to show variations in temperature.
Created by: emilybarnett