24 Waves, Sound & Light
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| wave | a disturbance that moves through matter or space
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| transverse wave | a mechanical wave that causes particles in matter to move back and forth at right angles to the direction in which the wave travels
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| compressional wave | a mechanical wave that causes particles in matter to move back and forth along the same direction in which the wave travels
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| wavelength | the distance between a point on a wave and the nearest point moving with the same speed and direction
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| frequency | the number of wavelengths that pass by a point each second
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| law of reflection | the angle that the incoming wave makes with the normal equals the angle that the outgoing wave makes with the normal
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| refraction | the change in direction of a wave when it changes speed as it travels from one material to another
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| diffraction | the bending of waves around an object
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| intensity | the amount of energy that a wave carries past a certain area each second
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| pitch | the human perception of the frequency of sound (how high or high low a sound is)
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| reverberation | repeated echoes
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| electromagnetic waves | waves that can travel through natter or through empty space
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| electromagnetic spectrum | the complete range of electromagmetic wave frequencies and wavelengths
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| infrared waves | have wavelengths between .001 meters and 700 billionths of a meter
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| ultraviolet waves | have wavelengths between 400 billionths and 10 billionths of a meter
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| spectrum | a range of values or properties
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| perception | a recognition, sense, or understanding of something
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| density | the mass per cubic meter of a substance
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