Reflection - When light bounces off a surface, Refraction - When light changes direction when it crosses a boundary., Translucent - When most light can pass through., Transparent - When all light passes through, Opaque - When no light can pass through, Echo - When sound reflects off an object, Longitudinal - When energy and vibrations travel parallel to one another , Transverse - when energy and vibrations travel perpendicular to one another., Amplitude - The height of a wave above the mid line., Frequency - The number of waves per minute., EM spectrum - A range of all Electromagnetic radiation, Pitch - How high or low a noise sounds., Volume - How loud or quiet a sound is., Eardrum - A part of our ear that vibrates., Retina - The light sensitive layer of our eyes.,

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