![]() Bohr’s theory does not explain either the Zeeman Effect or Stark Effect. Similarly, when the excited H-atom is placed in an electrical field, then similar splitting of the spectral line takes place, which is called ‘Stark Effect’. Therefore, if the source, which is producing the Na-spectrum, is placed in a weak magnetic field, it causes the splitting of two lines of Na into component lines. This type of splitting of spectral lines is called ‘Zeeman Effect’. When the excited atoms of hydrogen, which give an emission of line spectrum, are placed in a magnetic field, its spectral lines further split up into closely spaced lines. Still, researches have shown that the motion of the electron is not in a single plane, but takes place in three-dimensional space. Bohr suggested circular orbits of electrons around the nucleus of the hydrogen atom. The appearance of several lines in a single line suggests that only one quantum number is not sufficient to explain the origin of various spectral lines. This is called fine structure or multiple structures. The Ha-line in Balmer series is found to consist of five component lines. When the spectrum of hydrogen gas is observed using a light resolving power spectrometer, the individual spectral lines are replaced by several very fine lines, i.e., original lines are seen divided into other lines. However, this theory is not able to explain the origin of the spectrum of a multi-electrons system like He, Li and Be etc.
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