Niels henrik david bohr (niels henrik david bohr,1885.10.7 ~1962.1.18), a Danish physicist, holds a master's degree and a doctor's degree from the University of Copenhagen, and is an academician of the Royal Danish Academy of Sciences. 1 Bohr proposed Bohr model to explain the spectrum of hydrogen atoms by introducing quantization conditions. He proposed complementary principle and Copenhagen explanation to explain quantum mechanics. He was also the founder of Copenhagen School, which had a far-reaching influence on the development of physics in the 20th century.