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electromagnetic spectrum

the range of wavelengths of electromagnetic radiation from gamma rays (very short waves) to radio waves (very long waves). The human eye is sensitive to only a narrow range of wavelengths of approximately 400 to 700 nm. See spectrum.

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Psychology term of the day

February 27th 2024

empirically keyed test

empirically keyed test

an assessment in which answers are scored in such a way as to establish differences in responses among groups already known to differ. For example, on a test measuring problem solving, the correct alternative among the response choices would be the one preferred by members of a criterion group who were administered the test previously. See also empirical-criterion keying.