Examlex
What were the major agencies involved in relief efforts during the early period of the New Deal? How effective were they? What were some of their major accomplishments?
Afterimage
A visual phenomenon where an image continues to appear in one's vision after the exposure to the original image has ceased.
Opponent Cells
Specialized cells in the visual system that help perceive color by opposing each other.
Pitch
The perception of the frequency of a sound, determining how high or low a tone sounds.
Frequency
The rate at which a vibration occurs that constitutes a wave, either in a material (as in sound waves) or in an electromagnetic field (as in radio waves and light), usually measured in hertz.
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