Examlex
Two isotopes of the same element differ only in the number of neutrons found in the nucleus.
Outer Space
The physical universe beyond the earth's atmosphere, characterized by a vacuum and extreme temperatures.
Frequency
The number of occurrences of a repeating event per unit of time, often used to measure the waves of sound and light.
Sound Wave
A wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air.
Opponent-Process Theory
A psychological and neurological model that describes how we perceive colors as the result of complex processes involving opposing responses from different types of cells in the eyes.
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