What is the difference in spectra between a sodium lamp and a candle flame?

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SUMMARY

The discussion focuses on the spectral differences between a sodium lamp and a candle flame. A sodium lamp produces a distinct line emission spectrum due to the excitation and de-excitation of sodium atoms, emitting primarily yellow light. In contrast, a candle flame generates a continuous spectrum resulting from the combustion of paraffin, which includes a range of wavelengths and can produce black soot as a byproduct. This fundamental difference in emission types explains why the two light sources, despite appearing similar in color, have different spectral characteristics.

PREREQUISITES
  • Understanding of atomic excitation and de-excitation processes
  • Familiarity with emission spectra and spectroscopes
  • Basic knowledge of combustion chemistry, particularly paraffin
  • Concept of continuous versus line spectra
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  • Learn how to use a spectroscope effectively
  • Study the combustion process of hydrocarbons, specifically paraffin
  • Explore the differences between continuous and line spectra in various light sources
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Homework Statement


Hi,
I'm having a bit of trouble explaining this physics phenomenon:

A sodium lamp emits yellow light; that to the human eye appears to be quite similar to a
candle flame in colour. When light from these two sources is viewed through a
spectroscope, it is found that their spectra are very different. Explain the differences in the
two spectra produced.

I understand that when the electrons of the sodium atoms are excited and fall down to ground state they will release a yellow photon, which explains the line emission spectra from the lamp but I don't know what spectra will be produced by the candle.

Thank you!

Homework Equations


No relevant equations


The Attempt at a Solution


see above
 
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Here is a hint: Candle wax contains paraffin. So when this burns it contains an element that burns yellow as it is being oxidized. This element also forms as black soot sometimes.
 
Thank you! i get it now
 

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