Library — D
This page provides access to all physics articles covering topics that begin with the letter D.
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Drift Velocity
Drift velocity is a fundamental concept in electricity and solid-state physics that describes the average velocity with which charged particles move through a conductor when an electric field is applied. Although charges inside a metal—typically…
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Drift Current
Drift current is the net electric current that arises in a material when charged particles experience an external electric field and begin to move with an average velocity in the direction of that field. Even…
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Doppler Effect
The Doppler effect is a fundamental phenomenon that arises whenever there is relative motion between a wave source and an observer. It describes the change in the observed frequency and wavelength of a wave compared…
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Displacement
Displacement is one of the most fundamental ideas in physics, yet it is also one of the most frequently misunderstood. At first glance, it may seem interchangeable with distance, but the two describe very different…
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Degree of Freedom
In physics, the degree of freedom stands as one of the most fundamental yet far-reaching ideas, connecting diverse branches such as mechanics, thermodynamics, quantum theory, and statistical mechanics. At its heart, this concept quantifies how…
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Diffraction
Diffraction is a fundamental wave phenomenon that occurs when a wave encounters an obstacle or passes through an opening and subsequently bends, spreads, or changes direction. Although people often associate diffraction with light, it is…
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Density
Density is a fundamental physical property that describes how much mass is contained within a given volume of a substance. At its core, density explains how tightly matter is packed. Even though two objects may…