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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

• a = internal energy per gram
• b = growth rate

${\displaystyle a\approx (bc)^{2}f}$

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

## References

1. ^ http://nuclearweaponarchive.org/Nwfaq/Nfaq4-1.html
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.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Bethe–Feynman_formula — Please support Wikipedia.

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