Question: how much energy was released by the hiroshima bomb
Answer: 2 GWh The Little Boy atomic bomb dropped on Hiroshima on August 6 , 1945 , exploded with an energy of about 15 kilotons of TNT ( 63 TJ ) , and the Fat Man atomic bomb dropped on Nagasaki on August 9 , 1945 , exploded with an energy of about 20 kilotons of TNT ( 84 TJ ) .