1939, with the help of Leo Szilard and others, he sent a letter to US President franklin roosevelt, which directly contributed to the start of the Manhattan Project. After World War II, he actively advocated peace and opposed the use of nuclear weapons, and signed the Russell-Einstein Declaration.
Einstein initiated a new era of modern science and technology and was recognized as the greatest physicist after Galileo. 19965438+In February, Einstein was selected as the "century man" of the 20th century by American Time magazine.
Extended data:
1, light quantum hypothesis
Like atomic electrons, light has particle properties, and this particle property of light is called light quantum. Like Planck's energy quantum, the energy of each photon is E=hν, and the momentum of each photon is p=E/c=h/λ according to the mass-energy relationship of relativity.
2. Special theory of relativity
Special relativity includes not only a series of inferences such as time expansion, but also the transformation of Maxwell-Hertz equation. Special relativity requires the use of mathematical tools that introduce tensors.
3. General relativity
1905, Einstein published a paper on the influence of gravity and acceleration on light in special relativity, and the prototype of general relativity began to take shape.
Baidu encyclopedia-Einstein
1 and sum refer to new things obtained by adding two or more things with the same attributes, and can also be narrowly under