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Ally Brown

Chapter 17/18

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 the 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 wave travels
Compression An area of where the particles in a medium are 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 seperating two media
Periodic Motion Any motion that repeats at regular intervals
Period The time required for one cycle
Frequency The number of complete cycles in a given time
Hertz Cycles per second, measures frequency.
Wavelength The distance between a point on one wave and the same point on the next cycle of the wave.
Amplitude The maximum displacement of a point from its rest position
Reflection 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 Occurs when two or more waves overlap or combine
Constructive Interference Occurs when two or more waves combine to produce a wave with a larger displacement
Destructive Interference Occurs when two or more waves combine to produce a wave with smaller displacements
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
Electromagnetic Waves Transverse waves consisting of changing electric fields and changing magnetic fields
Electric Field A region of space exerts electric forces on charged particles
Magnetic Field A region of space produces magnetic forces
Electromagnetic Radiation The transfer of energy bu electromagnetic 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 of area
Electromagnetic Spectrum The full range of frequencies of electromagnetic radiation
Amplitude Modulation The amplitude of the wave is varied, the frequency remains the same.
Frequency Modulation The frequency of the wave is varied, the amplitude remains the same.
Thermograms Color-coded pictures that show variations in temperatures.
Created by: alyssa.brown