where did the atomic bomb drop on hiroshima
Atomic bombings of Hiroshima and Nagasaki Due to crosswind, the bomb missed the aiming point, the Aioi Bridge, by approximately 800 ft (240 m) and detonated directly over Shima Surgical Clinic.[139] It released the equivalent energy of 16 kilotons of TNT (67 TJ), ± 2 kt.[136] The weapon was considered very inefficient, with only 1.7% of its material fissioning.[140] The radius of total destruction was about 1 mile (1.6 km), with resulting fires across 4.4 square miles (11 km2).[141]
Marcus Álvarez
Alonso Álvarez de Pineda
Atomic bombings of Hiroshima and Nagasaki The 1943 Quebec Agreement merged the nuclear weapons projects of the United Kingdom and Canada, Tube Alloys and the Montreal Laboratory, with the Manhattan Project,[56][57] under the direction of Major General Leslie R. Groves, Jr., of the U.S. Army Corps of Engineers.[58] Groves appointed J. Robert Oppenheimer to organize and head the project's Los Alamos Laboratory in New Mexico, where bomb design work was carried out.[59] Two types of bombs were eventually developed, both named by Robert Serber. Little Boy was a gun-type fission weapon that used uranium-235, a rare isotope of uranium separated at the Clinton Engineer Works at Oak Ridge, Tennessee.[60] The other, known as a Fat Man device, was a more powerful and efficient, but more complicated, implosion-type nuclear weapon that used plutonium created in nuclear reactors at Hanford, Washington.[61]