Of-7 Absorption Lines of Sodium

Aim

To demonstrate that sodium vapour absorbs wavelengths equal to its emission spectra.

Apparatus

  • Spectrometer
  • Sodium Spectral lamp
  • Bunsen Burner
  • Slide Projector
  • Tripod
  • Wire Gauze
  • Table Salt
  • 2 Lab Jacks
  • Transmission Diffraction Grating
  • Flexicam camera and monitor

Absorption Line of Sodium 2

Description

A white light source from a slide projector is directed onto a high quality diffraction grating located on the prism table of the student spectrometer. A continuous spectrum is displayed on the monitor. A bunsen burner located directly in front of the entrance slit of the spectrometer heats a wire grid that has been coated with table salt. The distinct dark absorption lines of sodium appear in the yellow region of the visible spectrum.

Video

Safety Notes

Absorption Line of Sodium SOP-2