Mechanical wave - wave that travels only through matter, Electromagnetic wave - wave that can travel through empty space or through matter, Transverse wave - wave in which disturbance moves perpendicular to the direction of the wave travel, Longitudinal wave - wave that makes the particles of a medium move back and forth parallel to the direction the wave travels, Frequency - number of wavelengths that pass a point each second, Amplitude - maximum distance a wave varies from its rest position, Refraction - a change in direction of a wave as it changes speed, moving from one medium into another, Transparent - material that allows most of the light that strikes it to pass through, objects can be seen clearly,

Grade 7 chapter 6

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