Why can't sodium vapour lamp be used in spectrometer experiment

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SUMMARY

The discussion highlights the preference for using a mercury vapor lamp over a sodium vapor lamp in spectrometer experiments aimed at determining the refractive index of a prism for various colors. Mercury vapor lamps produce a broader spectrum of visible colors, including ultraviolet light, which is essential for accurate measurements and safety considerations. In contrast, sodium vapor lamps emit a limited spectrum primarily consisting of yellow light, making them unsuitable for experiments requiring diverse color analysis.

PREREQUISITES
  • Understanding of spectrometer functionality
  • Knowledge of light spectra and color analysis
  • Familiarity with mercury vapor lamp and sodium vapor lamp characteristics
  • Awareness of safety precautions related to ultraviolet light exposure
NEXT STEPS
  • Research the spectral output of mercury vapor lamps versus sodium vapor lamps
  • Learn about the safety measures for handling ultraviolet light in laboratory settings
  • Explore the principles of refractive index measurement using spectrometers
  • Investigate the applications of different light sources in optical experiments
USEFUL FOR

Physics students, laboratory technicians, and researchers involved in optical experiments or studying light properties will benefit from this discussion.

harini_5
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i was working with a spectrometer and the aim of the experiment was to find the refractive index of a prism for various colors.
i was asked specifically to use mercury vapor lamp and was insisted not to use sodium vapour lamp.
why is it so?
 
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harini_5 said:
for various colors.
How many colors are in a Na vapor lamp?
How many in an Hg
 
And the ones you can't see in Hg can be a eye safety concern. i.e. Ultraviolet.

Hopefully precautions are being taken.
 
mgb_phys said:
How many colors are in a Na vapor lamp?
How many in an Hg

sir can u please tell me the difference between the two spectra,interms of colors etc?
 
FG04_03.jpg

http://physics.uoregon.edu/~jimbrau/astr122/Notes/Chapter3_4.html"
 
Last edited by a moderator:
dlgoff said:
FG04_03.jpg

http://physics.uoregon.edu/~jimbrau/astr122/Notes/Chapter3_4.html"

A wonderful illustration of why mercury is preferable to sodium.
 
Last edited by a moderator:

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