Smoky flame of Bunsen burner gives continuous spectrum, whereas its blue flame gives band spectrum. Explain?

Asked by rushabhjain.a | 25th Mar, 2019, 09:42: PM

Expert Answer:

in smoky flame, radiation is coming from lot of soot particles. These soot particles while burning gives grey body radiation
Hence we get continuous spectrum.
 
We get blue flame, when the fuel used in burner is completely oxidized and no soot particles are produced in the flame.
When the fuel is completely oxidized, appreciable amount of energy is produced due to oxidation reaction
and this energy excites the gas molecules.
 
hence we get band radiation from excited molecules and ions.

Answered by Thiyagarajan K | 25th Mar, 2019, 10:44: PM

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