Question

The spectral line obtained when an electron jumps from n=6 to n=2 level in hydrogen atom belongs to the:
(A) Balmer series
(B) Lyman series
(C) Paschen series
(D) Pfund series

Answer 1

Balmer series is a series of spectrum emission lines of hydrogen atom which results when electron transition occurs from higher level down to energy level with principal quantum number 2. Paschen series is a series of spectrum emission lines of hydrogen atom which results when electron transition occurs from higher level down to energy level with principal quantum number 3.

Complete solution step by step:
-When a substance absorbs energy, it emits radiation. Spectrum of such radiation is called emission spectrum.
-Atoms, molecules or ions that absorb radiations are called excited.
-Spectrum of visible light is continuous. Spectrum of atoms in gaseous state do not show continuous spectrum but they emit light at specific wavelengths with dark spaces between them. Such spectrum is called line spectrum or atomic spectrum.
-Line emission spectrums are important to understand electronic structure.
-each element has a unique line emission spectrum. When an electric discharge is passed through gaseous hydrogen, hydrogen molecules dissociate and energetically excited hydrogen atoms produce electromagnetic radiations of discrete frequencies.
-Hydrogen spectrum consists of several series of lines named after discoveries.
-Balmer showed when spectral lines are expressed in terms of wavenumber, then visible lines of hydrogen spectrum have following formula:
$\overline{\nu }=109.677\left( \frac{1}{{{2}^{2}}}-\frac{1}{{{n}^{2}}} \right)c{{m}^{-1}}$
Where n is an integral equal to or greater than 3
Series of lines described by this formula are called Balmer series.
-Balmer series are only lines in the hydrogen spectrum which appear in visible regions.
-First five series of lines that correspond to ${{n}_{1}}$=1,2,3,4,5 are known as Lyman, Balmer, Paschen, Bracket and Pfund series respectively.
-Lyman series of lines appears in the Ultraviolet region. Paschen, Bracket and Pfund series of lines appear in the infrared region.
The spectral line obtained when an electron jumps from n=6 to n=2 level in a hydrogen atom belongs to the (A) Balmer series.

Note: -Spectrum of visible light is continuous. Spectrums of atoms in gaseous state do not show continuous spectrum but they emit light at specific wavelengths with dark spaces between them. Such spectrum is called line spectrum or atomic spectrum. Balmer showed when spectral lines are expressed in terms of wavenumber, then visible lines of hydrogen spectrum have following formula:
$\overline{\nu }=109.677\left( \frac{1}{{{2}^{2}}}-\frac{1}{{{n}^{2}}} \right)c{{m}^{-1}}$
Where n is an integral equal to or greater than 3