The bomb dropped in Hiroshima was Little Boy having 9000 lb in weight and using Uranium 235 as fuel. The Nagasakki bomb - Fat man - 10, 000 pound in weight used Plutonium 239 as fuel.

Both bombs were dropped by Capt Paul Tibbet, US pilot of Enola Gay. Plane has 9 crews and 4 scientists. The bomb was dropped in Hiroshima at 0815 h (local time) and after 51 second of time it exploded at a height of 2000 ft above sea level. During explosion light, heat and radiations with shock (high pressure) waves produced. The death toll on both bombs stand at 0.34 million.