"Richard Harrison" wrote in message
...
Just to quibble a bit, the atomic bomb was efficient for an explosive of
its weight, equal to megatons of conventional explosives.

To quibble a bit more, the "Little Boy" uranium atomic bomb dropped on
Hiroshima weighed about four to five tons and was the equivalent of about
10 to 15 kilotons of conventional (TNT) explosives. The "Fat Man"
plutonium bomb dropped on Nagasaki had the equivalent of about 20 to 22
kilotons of conventional explosives. The variance in numbers is based on
quotes from different sources.