Library — R
This page provides access to all physics articles covering topics that begin with the letter R.
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Refraction
Refraction is a fundamental phenomenon in physics that describes the change in direction of a wave as it passes from one medium into another where its speed is different. This behavior is most commonly observed…
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Reflection
Reflection is a fundamental phenomenon in physics that occurs when a wave encounters a boundary or interface between two different media and bounces back into the original medium. While the term is most commonly associated…
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Resistivity
Resistivity is a fundamental property of materials that characterizes how strongly they oppose the flow of electric current. It is intrinsic to the material itself and does not depend on the shape or size of…
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Rest Mass
Rest mass, often referred to as invariant mass, is one of the most fundamental and enduring concepts in modern physics. It serves as a cornerstone for understanding the nature of matter, energy, and motion in…