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| the distance from the crest (or trough) of a wave to its resting position |
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| a piece of glass or other transparent material that can bend parallel rays of light so that they focus at a single point |
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| the number of waves that pass a point in a period of time (speed) |
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| the distance between two identical points on two adjacent waves |
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| the type of wave in which light and electromagnetic energy travel |
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| the ability to cause change |
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| a wave that compresses (sound moves in this type of wave) |
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| the area of a wave where vibrating particles are close together (packed densely) |
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| radio waves, infrared, visible light, ultraviolet, x-rays, gamma rays |
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| the lowest point of a wave |
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| the highest point of a wave |
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| the area of a wave where vibrating particles are not close together (packed loosely) |
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| the highness or lowness of a sound (determined by frequency) |
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| the rhythmical and steady movement to and fro |
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| the colors we are able to detect with our eyes |
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