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The distance from the peak of one light or sound wave to the peak of the next. Electromagnetic wavelengths vary from the short blips of cosmic rays to the long pulses of radio transmission.
Weber’s Law
The principle that, to perceive their difference, two stimuli must differ by a constant minimum percentage (rather than a constant amount).
Young- Hemholtz Trichromatic Theory
The theory that the retina contains three different color receptors- one most sensitive to red, one to green, and one to blue- which when stimulated in combination can produce the perception of any co