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Students create and revise their own models of how light travels, is reflected, absorbed and transmitted. Students contrast white light with the light from a laser pointer. Students learn about frequency, wavelength and the energy of a wave by contrasting the properties of light from a laser with those of the light from a flashlight or a light bulb. Students also integrate qualitative scientific and technical information to support the claim that digitized signals are a more reliable way to encode and transmit information than analog signals.