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Jason Frankland

Chapter 17 vocabulary

TermDefinition
Mechanical wave Disturbance in matter that carries energy from one place to another.
Medium The material through which a wave travels.
Crest The highest position of a 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 waves.
Compression Area where the particles in a medium are spaced close together.
Rarefaction Area where the particles in a medium are spread out.
Longitudinal wave Wave in which the vibration of the medium is parallel to the direction the wave travels.
Surface wave Wave that travels along a surface separating two media.
Periodic motion Any motion that repeats at a regular time intervals.
Frequency The number of complete cycles in a given time.
Hertz (Hz) 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 interfernce The interaction among two or more waves in which displacements combine to produce a wave with a larger 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 changed 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 waves 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 its amplitude remains the same.
Thermograms A color-coded picture using variations in infrared radiation to show variations in temperature.
Created by: jason.frankland
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