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The bomb exploded about 500 m. (1,625 ft.) above the ground and directly beneath it (the hypocentre) was a suburb of schools, factories, and private houses. The radius of destruction for reinforced concrete buildings was 750 m. (2,437 ft.), greater than at Hiroshima where the blast caused by the bomb was more vertical.
The U.S. attacked Japan on August 6, 1945 using a gigantic, atomic bomb, codename âLittle Boyâ, that was equivalent to 20,000 tons of TNT. The bomb was dropped in Hiroshima and destroyed the city, killing thousands of civilians.he U.S. attacked Japan on August 6, 1945 using a gigantic, atomic bomb, codename âLittle Boyâ, that was equivalent to 20,000 tons of TNT. The bomb was dropped in Hiroshima and destroyed the city, killing thousands of civilians.