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Ken

A ken is a traditional Japanese unit of length used mainly in architecture and construction. It measures the distance between two pillars in traditional Japanese buildings and is roughly equivalent to 6 Japanese feet (shaku) or about 1.82 meters (approximately 6 feet).

The ken was a standard module in Japanese design, influencing room sizes and proportions in temples, houses, and other structures. Its use helped maintain harmony and consistency in traditional building layouts.

Though largely replaced by the metric system today, the ken remains significant in studying traditional Japanese architecture and cultural heritage.

Summary:

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  1 ken ≈ 1.82 meters (6 feet)

  
  
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  Based on spacing between structural pillars

  
  
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  Used in traditional Japanese architecture

  
  
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  Important for historical and cultural studies

  
  

Bohr Radius

The Bohr radius is a fundamental physical constant that represents the average distance between the nucleus and the electron in a hydrogen atom in its ground state, according to the Bohr model of the atom.

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  Its value is approximately 5.29177 × 10⁻¹¹ meters (about 0.529 angstroms).

  
  
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  Named after physicist Niels Bohr, who introduced the model in 1913.

  
  
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  It sets a natural length scale in atomic physics and quantum mechanics.

  
  
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  Used to describe atomic sizes and electron orbitals.

  
  

Key facts:

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  Bohr radius ≈ 5.29 × 10⁻¹¹ m

  
  
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  Represents the typical size of a hydrogen atom’s electron orbit

  
  
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  Fundamental to quantum physics and atomic structure

  
  

The Bohr radius is essential for understanding atomic dimensions and quantum behavior of electrons.