Library — R
This page provides access to all physics articles covering topics that begin with the letter R.
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Refraction
Let’s begin by understanding what we mean by refraction. Refraction is a fundamental optical phenomenon where a wave changes its direction and propagation behavior as it moves from one medium into another with different physical…
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Reflection
# What is Reflection? ## Introduction Reflection is a fundamental phenomenon in wave physics whereby a wave encounters a boundary between two different media and returns into the medium from which it originated. This process…
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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…