Question

The atomic hydrogen emits a line spectrum consisting of various series. Which series of hydrogen atomic spectra lie in the visible region?

• A. Balmer series
• B. Lyman series
• C. Brackett series
• D. Paschen series

Answer 1

The correct option is A

Balmer series

The explanation for the correct option:

Option (A): Balmer series

1. When an electric discharge travels across gaseous hydrogen molecules, the Hydrogen Spectrum is created. As the gas separates, the hydrogen atom enters an excited state and emits a variety of radiations.
2. The hydrogen spectrum lines, which make up each radiation, are individual lines with well-defined wavelengths.
3. Lyman, Balmer, Paschen, Brackett, and Pfund are various series of hydrogen spectra.
4. The Balmer series makes up the hydrogen emission spectrum. It is in charge of an electron's excitation from the second shell to any other shell.
5. The electromagnetic spectrum only contains this set of lines, which are visible.
6. In the visible spectrum, there are four of these lines. Other names for them include the Balmer lines. The wavelengths of the four hydrogen Balmer lines that can be seen are $410\mathrm{nm}$, $434\mathrm{nm}$, $486\mathrm{nm}$, and $656\mathrm{nm}$.
7. These are brought on by photons generated by excited electrons moving to more stable energy levels.
8. Hence, it is the correct option.

The explanation for the incorrect option:

Option (B): Lyman series

1. The lines that the electron emits as it moves from an outer orbit with a quantum number $\mathrm{n}>1$ to the first orbit with a quantum number ${\mathrm{n}}^{\text{'}}=1$ are included in the Lyman series in the Bohr model.
2. They lie in the Ultra violet region.
3. Hence, it is an incorrect option,

Option (C): Brackett series

1. The wavelengths of the Brackett series, a type of spectral line series, lie in the infrared range.
2. It ranges from ${\mathrm{n}}_1=4$ to ${\mathrm{n}}_2=5,6,7...$
3. Hence, it is an incorrect option

Option (D): Paschen series

1. They lie in infrared regions.
2. It ranges from ${\mathrm{n}}_1=3$ and ${\mathrm{n}}_2=4,5,6...$
3. Hence, it is an incorrect option.

Therefore, Balmer series of hydrogen atomic spectra lie in the visible region.