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Olivia Adams

Chapter 17 and 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 of the wave 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 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 Any motion that repeats at regular time intervals.
Period The time required for one cycle, a complete motion that returns to its starting point.
Frequency The number of complete cycles in a given time.
Hertz Frequency is measured in cycles per second.
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 the medium from its rest position.
Reflection Occurs when a wave bounces off a surface that it cannot pass through.
Refraction The blending of a wave as it enters a new medium at an angle.
Diffraction The blending of a wave as it moves around an obstacle or passes through a narrow opening.
Interfernce Occurs when two or more waves overlap and combine together.
Constructive Interference Occurs when two or more waves combine to produce a wave with a larger displacement.
Standing Wave A wave that appears to stay in one place.
Destructive Interference Occurs when two or more waves combine to produce a wave with smaller displacements.
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 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 by electromagnetic waves traveling through matter or across space.
Photoelectric Effect The emission or 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 electromagnetic radiation.
Amplitude Modulation The amplitude of the wave.
Frequency Modulation The frequency of the wave.
Thermograms Color-coded pictures that show variations in temperatures.
Created by: olivia.adams
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