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Who thought of the idea to build an atomic bomb?

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Einstein has some credit in the development of the nuclear bomb, but never thought of it himself... I believe it was Hitler who first thought of the atomic bomb. The Germans were working on a way to harness the energy from a split atom. Einstein sent the US president a letter, telling him of the power such a weapon could have, and the Germans were working on splitting atoms. That brought about the Manhattan Project.
The Einstein letter to FDR was actually entirely written by Leo Szilard, all Einstein did was sign it.
The writer H.G. Wells had imagined them and wrote about them in his 1914 novel "The World Set Free", but this was just SciFi.
Leo Szilard was the first to actually invent the process that makes the atomic bomb work (neutron chain reaction) in 1933 while in London and patented this on June 28, 1934.
A team of German scientists working in Germany and Sweden discovered fission in uranium-235 in 1939 and after the publication of their paper, Germany blocked further publication of the results of all research in nuclear physics.
By the time the Manhattan Project became fully active, Germany had already decided to scale back their nuclear project to just basic reactor research with the single goal of building power reactors after Germany won the war. They considered a bomb impractical in the time estimated to win the war by conventional means, even if it was possible (and Heisenberg's calculations suggested such a bomb would be too large for any available aircraft to deliver).
To Hitler the idea of an Atomic Bomb sounded like Jewish Physics, and thus nonsense. Hitler knew nothing of physics, nuclear or otherwise, and the teaching of Einstein's theories of relativity were already banned in Nazi Germany simply because Einstein was a Jew (implicitly making it Jewish Physics) regardless of any experimental evidence confirming the theories.
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Who Came With Idea For The Atomic Bombs?

The science fiction author H. G. Wells did and wrote about them in his 1914 novel The World Set Free.

Who had the atomic bomb idea?

 H. G. Wells thought of them and coined the term "atomic bomb"  for his 1914 novel The World Set Free. However he had no  idea how they might work.  Leo Szilard invented

What do you use to build an atomic bomb?

Materials Needed Materials needed to make an atomic bomb are: fissionable material (Plutonium239 isotope) explosive to start the nuclear chain reaction (TNT, Gelignite or

What did it take to build the atomic bomb?

Making the bombshell was easy, but the challenge was getting the right type of fissionable material, which was uranium and plutonium. Another big one was on how to trigger the

What are the inputs to building an atomic bomb?

Unsure of your term "inputs". To construct a nuclear weapon, it requires a source of scarce fissionable materials, such as Uranium 235, or Plutonium. It requires the ability t

Why atom bombs is a great idea?

President Truman stated that he needed to end the war and to collapse Japan's means to make war ever again.

Why atom bombs is a bad idea?

There are a few reasons why dropping the atomic bombs was a bad thing. 1) They caused civilian loss of life which only increased anti-americanism and would just breed resent

When did the US get the idea of the atomic bomb?

Further to previous answer,yes Germany & Jaapan were working onit, but it was actually BRITAIN who passed on the research done in 1940 to USA . Called "The Manhattan Project"

Why build an atomic bomb?

The U.S. originally built the atomic bomb to end WW2 because it was the only alternative to invading Japan, which would have cost many, many more lives and been worse for all

How did the us build the atom bomb?

Had we not developed the atom bomb, someone else would have. It's only natural for mankind to exploit our technology, and we were way ahead of the rest of the world. The atom

When was the atom bomb thought of?

The writer H. G. Wells thought of it about  1913 and published his science fiction  novel The World Set Free with it as the central plot line  in 1914.    The physic