Mechanical Waves
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| The matter through which a mechanical wave travels; can be a solid, liquid, or gas | Medium
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| Disturbances that transmits energy through matter | Mechanical wave
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| The number of crests that pass a certain point in a given amount of time | Freqency
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| Cycles per second, or how many crests pass a certain point per second | Hertz (Hz)
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| High pressure area. Particles of the wave are crowded together | Compressioin
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| Low pressure area where particles are spread out | Rarefaction
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| Particles of the medium vibrate in a direction perpendicular to the direction the wave moves (think stadium wave) | Transverse Wave
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| The highest point of the wave above the rest position | Crest
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| The lowest point of a wave below the rest position | Trough
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| Particles of the medium vibrate in a direction parallel to the direction the wave moves (think slinky) | Longitudinal Wave
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| The distance from one crest to the next crest | Wavelength (T)
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| The distance from the midpoint to the height of the crest or bottom of the trough | Amplitude
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| The distance from the end of one compression to the end of the next compression or the end of one refraction to the next refraction | Wavelength (L)
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| Particles move both parallel and perpendicular to the motion of the wave and their motion becomes circular | Surface Wave
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