Author motto: Niels Bohr (October 7, 1885 - November 18, 1962), the Danish physicist, Master / PhD University of Copenhagen, the Royal Danish Academy of Sciences, won the Royal College of paper gold Denmark Medal, University of Manchester University of Cambridge and an honorary doctorate in 1922 won the Nobel Prize in Physics. By introducing Bohr quantization condition, Bohr model proposed to explain the hydrogen atom spectrum; propose complementary principle and Copenhagen interpretation of quantum mechanics to explain, he was the founder of the Copenhagen School, had a profound influence on the development of twentieth century physics .