Bethe–Feynman formula

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The Bethe–Feynman efficiency formula, a simple method for calculating the yield of a fission bomb,[1] was first derived in 1943 after development in 1942. Aspects of the formula are speculated to be secret restricted data.[2]

Related formula[edit]

  • a = internal energy per gram
  • b = growth rate
  • c = sphere radius

A numerical coefficient would then be included to create the Bethe–Feynman formula—increasing accuracy more than an order of magnitude.[3]

See also[edit]


  1. ^
  2. ^ Meeting and working with Richard Feynman at Los Alamos, Web of Stories, story by Hans Bethe recorded in December 1996, last accessed 2015/04/20.
  3. ^ Hans Volland (1995). Handbook of atmospheric electrodynamics, Volume 2. CRC Press. ISBN 0-8493-2520-X.