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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.



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



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



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



  • Used to describe atomic sizes and electron orbitals.



Key facts:



  • Bohr radius ≈ 5.29 × 10⁻¹¹ m



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



  • Fundamental to quantum physics and atomic structure



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



A statute mile is a unit of length commonly used in the United States and the United Kingdom. It is officially defined as 5,280 feet or 1,609.344 meters. The term "statute mile" distinguishes it from other types of miles, such as the nautical mile. The origin of the statute mile dates back to an Act of Parliament in England in 1593, which standardized the length of the mile. It is primarily used for measuring distances on land, such as in road signs, speed limits, and maps. While many countries have adopted the metric system, the statute mile remains in everyday use in a few countries. In contrast to the nautical mile, which is used for air and sea navigation, the statute mile is mainly applied in land-based contexts. It is also used to calculate speed in miles per hour (mph), especially for vehicles and road travel.


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