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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