Balmer Series And Emission Spectra

Item Code: SK071

Principle and Working:

Hydrogen atoms in a discharge lamp emit a series of lines in the visible part of the spectrum. This series is called the Balmer series which continues into the ultraviolet range. Bunsen-Kirchoff spectroscope is ideal for observation and measurement of emission and absorption spectra. ...

In the present setup, the Balmer series of hydrogen and wavelengths of unknown gases can be studied using this spectroscope. The scale tube of the spectrometer is initially calibrated with the help of mercury light source so that the marked numbers on the scale tube correspond to the particular wavelength of light. Subsequently the emission spectrum of hydrogen and nitrogen can be investigated.




  • Direct reading spectroscope with adjustable arms
  • Self Centring Slit of SS material.
  • Hydrogen atom filled spectrum tube (USA make).
  • High Voltage spectrum tube (5kV) with safety door and thermal switch.
  • Mercury light source with output power 125 W.

  • Observing the Balmer series of hydrogen using Bunsenkirchoff spectroscope.
  • Qualitative investigation of emission spectra.

  • Spectroscope : Observation tube moveable, with locking screw, slidable eyepiece, Objective 18 mm / 160 mm, Symmetrical slit Slit tube, Objective 18 mm / 160 mm, Stationary Scale tube, 200-division scale, Eyepiece 18 mm aperture, 90 mm Fl, Prism Flint glass (60°), Dispersion C-F 2°, Height 25 cm (approx.)
  • Spectrum Tube Power Supply : Input 220V, 50 Hz AC, Output 0- 5000V , Overload 2mA(Max.) Spring loaded socket
  • Spectrum Tube : Hydrogen Gas, Violet 420, 440nm, Blue 49nm, Red 670 nm
    • 1 Spectroscope (Bunsen-Kirchoff)
    • 1 Spectrum Tube Power Supply
    • 1 Hydrogen Tube
    • 1 Mercury Light Source
  • Bohr atomic model.
  • Visible spectrum.
  • Energy level.
  • Rydberg atom.
  • Rydberg’s constant.