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chap 17/18 vocab

TermDefinition
Mechanical Wave A disturbance in matter that carries energy from one place to another
Medium The material though which a wave travels
Crest The highest point of the wave above the rest position
Trough The lowest point below the rest position
Transverse waves A wave that causes the medium to vibrate at right angles to the direction in 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 The repeating time intervals
Frequency Any periodic motion- Number of complete cycles in a given time
Wavelength The distance between a point on one wave and the same point on the next cycle of the wave
Hertz Frequency measure in cycles per second
Amplitude The maximum displacement of the medium from its rest position
Reflection Waves bounce 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 trough a narrow opening
Interference When two or more waves overlap and combind together
Constructive Interference When two or more waves combine to produce a wave with a larger displacment
Destructive Interference Occurs when two or more waves combine to produce a wave with a smaller displacement
Standing Wave A wave that appears to stay in one place
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
Period The time required for one cycle, a complete motion that returns to its starting position
Electromagnetic Waves Transverse waves consisting of changing electric fields and changing magnetic fields
Electrical Field Exerts electric forces on charged particles in a region OF space.
Magnetic Field Produces magnetic forces in a region of space
Electromagnetic Radiation The transfer of waves traveling through matter or across 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
Electromagnetic Spectrum The full range of frequencies of electromagnetic radiation
Amplitude Modulation The amplitude of the wave is varied
Frequency Modulation The frequency of the wave is varied
Thermograms A device that uses color-coded pictures that show variations in temperature
Created by: jacob.wallace
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