medium, Material through which a wave travels, amplitude, Height of a wave, transverse wave, A wave that moves the medium in a direction perpendicular to the direction in which the wave travels, longitudinal wave, A wave in which the vibration of the medium is parallel to the direction the wave travels, rarefaction, a part in a longitudinal wave where the particles are spread apart, diffraction, The bending of a wave as it moves around an obstacle or passes through a narrow opening, reflection, The bouncing back of a wave when it hits a surface through which it cannot pass., transmission, the passage of light through an object, refraction, The bending of a wave as it passes at an angle from one medium to another, constructive interference, The interference that occurs when two waves combine to make a wave with a larger amplitude, destructive interference, The interference that occurs when two waves combine to make a wave with a smaller amplitude

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