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Danielle Easterday

Chapter 17 Vocab.

TermDefinition
Mechanical Wave Is 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 point.
Trough The lowest point below the rest position.
Transverse Wave Is 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 Is a wave in which the vibration of the medium is parallel to the direction the wave travels.
Surface Wave Is 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 Is the number of complete cycles in a given time.
Hertz Frequency is measured in cycles per second.
Wavelength Is 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 Is the bending of a wave as it enters a new medium at an angle.
Diffraction Is the bending of a wave as it moves around an obstacle or passes through a narrow opening.
Intereference Occurs when two or more waves overlap and combine together.
Constructive Intereference 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 Is a wave that appears to stay in one place-it does not seem to move through the medium.
Node Is a point on a standing wave that has no displacement from the rest position.
Antinode Is a point where a crest or trough occurs midway between two nodes.
Electromagnetic Waves Are transverse waves consisting of changing electric fields and changing magnetic fields.
Electric Field Is a region of space that exerts electric forces on charged particles.
Magnetic Field Is a region of space that produces magnetic forces.
Electromagnetic Radiation The transfer of energy by electromagnetic waves traveling through matter or across space.
Photoelectric Sffect The emission of electrons from a metal caused by light striking the metal.
Photons The packets of electromagnetic energy.
Intensity Is 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 Moderation The amplitude of the wave is varied.
Frequency Modulation The frequency of the wave is varied.
Thermograms Are color-coded pictures that show variations in temperature.
Created by: soccerdani15