Noun
English Wikipedia has an article on:Bohr radiusWikipedia
Bohr radius (plural Bohr radiuses or Bohr radii)
(physics, chemistry) The radius of a hydrogen atom, according to a certain calculation; equal to about 53 picometers.
Although the model itself is now obsolete, the Bohr radius for the hydrogen atom is still regarded as an important physical constant. Source: Internet
Related scientific problems The plum pudding model with a single electron was used in part by the physicist Arthur Erich Haas in 1910 to estimate the numerical value of Planck's constant and the Bohr radius of hydrogen atoms. Source: Internet
The rate-constant of probability-decay in hydrogen is equal to the inverse of the Bohr radius, but since Bohr worked with circular orbits, not zero area ellipses, the fact that these two numbers exactly agree is considered a "coincidence". Source: Internet