Pitch - frequency of a sound wave, Intensity - amount of power per unit area, Loudness - ratio between the intensity of the actual sound to the intensity of the threshold of human hearing, Light - Electromagnetic waves, Electromagnetic spectrum - includes all the different types of electromagnetic radiation, Metric prefixes - placed before a unit name to indicate a multiple or submultiple of that unit, Polarization - effect that alters light so that the waves are all oscillating in the same plane, Polarizing filter - has a polarization axis in one direction that acts as a series of thin vertical or horizontal slits, permitting only light waves that are oriented in a single direction to pass, Photoelectric effect - when light hits a metallic surface, it can produce an electric current,

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