Niels Bohr ( 1885- 1962)

1. According to many scientists the history of modern theoretical atomic physics begins with Bohr’s atomic theory of 1913.

2. Niels Bohr, the great Danish physicist, was born in Copenhagen, Denmark. In 1903 he entered the University of Copenhagen and in 1907 he distinguished himself sufficiently to receive the gold medal of the Royal Danish Academy of Sciences. Two years later he received his degree of Master of Science in physics and in 1911 the doctorate, for which he had investigated the electron theory of metals.

3. In 1912 Bohr went to work at Rutherford’s laboratory in Manchester. Working at this laboratory he created his model of atom, retaining “ the nucleus and revolving electrons” of Rutherford’s atomic model and making use of Planck’s quantum theory. Bohr’s theory states that “ for each atom there exists a series of fixed orbits in which the electrons travel without emitting light. In these orbits electrons are in stationary states because their energy content does not change and they travel at uniform speed. However, disturbance by an impact or by exterior radiation may cause a temporary displacement of the electrons, which will at once try to return to the home orbit by means of jumps. Each jump is accompanied by the emission of a quantum of light, representing the difference in energy between the higher orbit just left and the lower orbit just occupied. His model gave the impetus to the development of quantum mechanics.

4. Niels Bohr received the Nobel Prize for Physics in 1922. He is a author of numerous books and papers.

II.Выберите правильный ответ в соответствии с содержанием текста:

1.Where was Bohr born?

a) Moscow b) Copenhagen c) London

2.Where did he get his higher education?

a) at Copenhagen University

b) at Moscow University

c) at Cambridge university

3.What field of science did he do his research in?

a) in the field of chemistry

b) in the field of electromagnetic waves

c) in the field of electron theory of atom.

III. Найдите соответствующие русские словосочетания.