It was detonated one thousand, eight hundred feet over the ground. The plane that dropped the bomb was the Enola Gay aircraft bomber. The same thing happened on August ninth over Nagasaki. The fatalities of Hiroshima were seventy thousand and Nagasaki forty thousand. The affects of the atomic bomb, or death-causing factors are the blast wave, thermal and nuclear radiation.
Radiation affects the skin and cell reproduction.
Now, The atomic bomb weighed only five pounds. The countries that are known to posess a bomb today are the US, Russia, Britain, France, India, and China. World Book Encyclopedia.