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Classical Electron Radius

The classical electron radius is a theoretical length scale associated with the electron, derived from classical electromagnetism. It represents the size of a hypothetical sphere where the electron’s electrostatic energy equals its rest mass energy.

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  Its value is approximately 2.818 × 10⁻¹⁵ meters (about 2.8 femtometers).

  
  
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  Calculated using fundamental constants: the electron charge, mass, and the speed of light.

  
  
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  It is not the actual physical size of the electron (which is considered point-like in quantum mechanics), but a useful scale in classical physics.

  
  
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  Used in scattering theory and classical electron models.

  
  

Key facts:

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  Classical electron radius ≈ 2.818 × 10⁻¹⁵ m

  
  
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  Represents an electromagnetic length scale, not a physical size

  
  
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  Important in classical models of electron behavior

  
  

This radius helps bridge classical and quantum views of particle physics.

Inch

An inch is a unit of length used primarily in the imperial and U.S. customary systems. It is commonly used in countries like the United States, Canada, and the UK for measuring shorter lengths. One inch equals 2.54 centimeters. There are 12 inches in a foot. Inches are often used to measure things like screen sizes, paper dimensions, or body measurements. For example, a standard smartphone screen might be about 6 inches. The symbol for inch is "in" or a double quote mark (″). Rulers, measuring tapes, and toolkits often include inches for easy reference. Although the metric system is more widely used globally, inches remain common in certain industries and countries for specific applications.