01:160:307 Chapter 12: Ch12
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18 Jul 2016
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Electromagnetic radiation causes a transition to a higher state; the energy difference, de, provides information. The human eye has small, medium and large cones, which have color sensitivity as shown; combined, they can capture an infinite number of color nuances. Electromagnetic radiation can be described as a wave having wavelength, , frequency, , and velocity, c. Alternatively, it can be considered as a particle with energy, e. The various types of radiation differ in wavelength, , and frequency, ; the human eye can detect a narrow range of wavelengths and also distinguish between them (at least most of us). Electromagnetic radiation: light and other forms of radiant energy. Wavelength ( ): the distance between consecutive peaks on a wave. Frequency ( ): the number of full cycles of a wave that pass a given point in one second; the unit is hertz, hz; 1 hz = 1 s 1 (read per second ).
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