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Lauren Reynolds

Chapter 17 and 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 the wave above the rest position.
Trough The lowest point of the wave below the rest position.
Transverse Waves 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 seperating 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 Cycles per second, or what frequency is measured in.
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 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 and combine together.
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 a smaller displacements.
Standing Wave A wave that appears to stay in one place- it does not seem to move through the medium.
Node A point on a 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 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 energy by electromagnetic waves traveling through matter or across space.
Photoelectric Effect The emission of electrons from ametal 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 temperature.
Created by: laurenreynolds