The bomb was not made in 1939. It was made in 1945 at the end of WW2. Oppenheimer did not make the bomb, a very large group of scientists and technicians made the bomb. Oppenheimer was the civilian head of the group. That is analogous to saying that a single person invented the rocket that took men to the moon.
The scientist given the most credit for the building of the atomic bomb is Robert Oppenheimer.
Robert Oppenheimer's big discovery was the atomic bomb
During WW 2, J. Robert Oppenheimer was appointed as technical director of the Manhattan Project. Under his guidance, the creation of the first atomic bomb occurred.
Robert Oppenheimer and his team of scientists.
Robert Oppenheimer is the father of nuclear bomb.
J. Robert Oppenheimer
Robert Oppenheimer.
Robert Oppenheimer was the chief scientist of the US development of atomic weapons. Thousands of people worked on the bomb in various capacities
The main character in creating the nuclear bomb was Robert Oppenheimer.
The first atomic bomb
Robert Oppenheimer.
After witnessing the test explosion of an A. bomb it has been reported that Oppenheimer said 'I am become Shiva, destroyer of worlds."