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The Physics Hypertextbook
The Physics Hypertextbook is a reaction to three big problems with textbooks: lack of writer's voice, layouts that reduce readability, and outdated economics.
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Photoelectric Effect – The Physics Hypertextbook
When light shines on some metal surfaces, electrons are ejected. This is evidence that a beam of light is sometimes more like a stream of particles than a wave.
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Viscosity – The Physics Hypertextbook
Informally, viscosity is the quantity that describes a fluid's resistance to flow. Formally, viscosity is the ratio of shearing stress to velocity gradient.