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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.



Earth’s Distance from the Sun


The average distance between the Earth and the Sun is known as an Astronomical Unit (AU).



  • It is approximately 149.6 million kilometers (about 93 million miles).



  • This distance varies slightly throughout the year because Earth’s orbit is elliptical—closest at perihelion (~147.1 million km) and farthest at aphelion (~152.1 million km).



  • The astronomical unit is a fundamental standard for measuring distances within our solar system.



Key facts:



  • Average distance ≈ 149.6 million km (1 AU)



  • Varies due to elliptical orbit



  • Basis for measuring planetary distances



Understanding Earth’s distance from the Sun is essential for studying seasons, climate, and orbital mechanics.



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