Page "Little Boy" Paragraph 4
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The bomb was armed in flight above the city, then dropped at approximately 08: 15 ( JST ) August 6, 1945.
After falling for 44. 4 seconds, the time and barometric triggers started the firing mechanism.
The detonation happened at an altitude of.
The official yield estimate of " Little Boy " was about 13 kilotons of TNT equivalent in explosive force, i. e. 6. 3 × 10 < sup > 13 </ sup > joules = 63 TJ ( tera-joules ).
The actual yield estimated after an analysis of blast damage was about 13 kilotons.
It was less powerful than " Fat Man ", which was dropped on Nagasaki ( 21 – 23 kt ). However, the damage and the number of victims at Hiroshima were much higher, as Hiroshima was on flat terrain, while the hypocenter of Nagasaki lay in a small valley.
According to figures published in 1945, 66, 000 people were killed as a direct result of the Hiroshima blast, and 69, 000 were injured to varying degrees ..
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1.866 seconds.