Question

who was Einstein why did he wrote a letter to Franklin Roosevelt

Answer 1

Answer: Einstein wrote a letter to Franklin Roosevelt when the Nazis were in Germany and he had to migrate

from there. The discovery of Nuclear fission in Germany made the American physicists upset that the Nazis could use an atom bomb.

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Answer 2

Answer:

When the Nazis came to power in Germany, Einstein emigrated to the United States of America. Five years later, the discovery of nuclear fission in Berlin had American physicists in an uproar. Many of them had fled from Fascism, just as Einstein had, and now they were afraid the Nazis could build and use an atomic bomb. Einstein wrote a letter to Franklin Roosevelt to warn him of the consequences of the explosion of an atomic bomb.