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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
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