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 \approx (bc)^2  f

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

See also[edit]


  1. ^
  2. ^ Hans Bethe: How I met Feynman at Los Alamos
  3. ^ Hans Volland (1995). Handbook of atmospheric electrodynamics, Volume 2. CRC Press. ISBN 0-8493-2520-X.