J. Robert Oppenheimer allowed for the fact that such a bomb existed as far back as May 10th, 1945. Remember that the Manhattan Project was undertaken using the utmost secrecy. The atomic bomb was first exploded at the top secret base of Alamogordo, NM on July 16th, 1945. The bomb was first used in warfare at Hiroshima and Nagasaki, Japan in August 1945. .
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I believe it was 1949 :)
1949
The US made atomic bombs from 1945 to 1992.
1974
The first atomic bomb test took place on April 16th, 1945. It was much too late to change the course of the war, but cost the US gov't more than $2B (more than $22B in today's dollars) and hundreds of thousands of workers; 130,000 to be specific.
The spies that gave the plans to the Soviets during the war:Ted HallKlaus Fuchsthe RosenburgsGreenglassetc.But the Soviets probably did not need this as they had their own team of scientists that could figure this out. The spies probably only sped up development by a year or two.Igor KurchatovYuli KharitonYakov ZeldovichGeorgii FlyorovAbram Fedorovich IoffeAndrei Sakharovetc.
1945 (not including testing)
The Soviets tested their first A-Bomb in 1949; one year before the start of the Korean War (1950-1953).
Never! Leo Szilard invented the atomic bomb in 1933.
1945
No, because the soviets already had all the atomic bomb secrets even before the bombs were dropped on Japan! The secrets were handed to them by spies at Los Alamos who were designing the bombs!The only thing that delayed a soviet atomic bomb from 1945 to 1949 when they detonated their copy of Fatman (built directly from stolen Fatman plans) was the time it took to build the industrial infrastructure needed to make plutonium and the other bomb components.Another thing to realize is there are no real secrets about nuclear weapons. It is all physics that any good physicist can figure out. The soviets actually had their own independent atomic bomb design by 1947 that was better than the stolen Fatman, but Beria would not let the atomic scientists build and test it until after the stolen Fatman design was tested (and nothing could be tested until 1949 as stated above). Both the US and USSR independently developed and tested hydrogen bombs only 1 year apart!
20019
1942
1945
1945
1945
1945
The first atomic bomb was made August 1945. My ? to you is," Why did they even start making those atomic bomb anyway?
The US made atomic bombs from 1945 to 1992.