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Marissa Russo

Chapter 17 Vocabulary

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 a transverse wave.
Trough the lowest point of a transverse wave.
Transverse Wave a wave that causes a medium to vibrate at right angles to the direction in which the wave travels.
Compression an area of a longitudinal wave where the particles of the medium are close together.
Rarefaction an area of a longitudinal wave where the particles of the medium are spread out.
Longitudinal Wave a wave in which the vibration of the medium is parallel to the direction the wave travels.
Periodic Motion any motion that repeats at regular time intervals.
Period a unit of geologic time into which geologist divide eras.
Frequency the number of complete cycles per unit time for a periodic motion.
Hertz the unit of measure for frequency equal to one cycle per second.
Wavelength the distance between a point on a wave and the same point on the next cycle of the wave.
Amplitude the maximum displacement of a medium from the rest position.
Reflection the interaction that 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 the interaction of two or more waves that combine in a region of overlap.
Constructive Interference the interference among two or more waves in which displacement combine to produce a wave with a large displacement
Destruction Interference the interference among two or more waves in which displacement combine to produce a wave with a smaller displacement
Standing Wave a wave that appears in one place and does not seem to move through a medium
Node a point on a standing wave that has no displacement from the rest position
Antinode a point of maximum displacement midway between two nodes in a standing wave
Sound Wave a longitudinal wave consisting of compression and rare fractions which travel through a medium
Electromagnetic Waves a transverse consisting of changing electric magnetic field
Electrical Field a field in a region of space that exerts electrical forces on charged particles a field produces by electrical charges or by changing magnetic fields.
Magnetic Field a field in a region of space that exerts magnetic forces
Electromagnetic radiation the transfer of energy by electromagnetic waves
Photoelectric Effect the emission of electrons from a metal caused by lightening striking the metal
Photons a packet of electromagnetic energy
Intensity the rate at which a waves energy flows through a given unit of area
Electromagnetic Spectrum the fuel range of electromagnetic radiation
Amplitude Modulation a method of transcending radio signal in which the amplitude of the waves frequency remains the same.
Frequency Modulation a method of transmitting a radio signal in which the frequency of the carrier wave varies while the amplitude remains the same.
Thermograms a color coded picture using vibration infrared vibration to show variation in temperature
Created by: marissa.russo