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Astronomical Unit (a.u.) of Length

The astronomical unit (a.u.) is a unit of length used primarily in astronomy to describe distances within our solar system. It is defined as the average distance between the Earth and the Sun.

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  1 astronomical unit ≈ 149,597,870.7 kilometers (about 93 million miles)

  
  
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  Used to measure distances between planets and other objects in the solar system

  
  
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  Provides a convenient scale for expressing space distances that are too large for kilometers but too small for light-years

  
  

The astronomical unit helps astronomers communicate and calculate orbits, planetary positions, and space missions with clarity and precision.

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.